| Date | Value | 
|---|---|
| Oct 30, 2025 | 40.74 | 
| Oct 1, 2025 | 39.90 | 
| Sep 1, 2025 | 39.23 | 
| Aug 1, 2025 | 38.27 | 
| Jul 1, 2025 | 37.79 | 
| Jun 1, 2025 | 36.31 | 
| May 1, 2025 | 35.18 | 
| Apr 1, 2025 | 32.63 | 
| Mar 1, 2025 | 34.79 | 
| Feb 1, 2025 | 37.19 | 
| Jan 1, 2025 | 37.14 | 
| Dec 1, 2024 | 37.72 | 
| Nov 1, 2024 | 37.36 | 
| Oct 1, 2024 | 36.59 | 
| Sep 1, 2024 | 35.70 | 
| Aug 1, 2024 | 35.08 | 
| Jul 1, 2024 | 35.48 | 
| Jun 1, 2024 | 34.81 | 
| May 1, 2024 | 33.78 | 
| Apr 1, 2024 | 33.03 | 
| Mar 1, 2024 | 33.76 | 
| Feb 1, 2024 | 33.04 | 
| Jan 1, 2024 | 31.97 | 
| Dec 1, 2023 | 31.45 | 
| Nov 1, 2023 | 30.01 | 
| Oct 1, 2023 | 28.70 | 
| Sep 1, 2023 | 29.80 | 
| Aug 1, 2023 | 30.09 | 
| Jul 1, 2023 | 30.89 | 
| Jun 1, 2023 | 29.94 | 
| May 1, 2023 | 28.76 | 
| Apr 1, 2023 | 28.77 | 
| Mar 1, 2023 | 27.94 | 
| Feb 1, 2023 | 28.92 | 
| Jan 1, 2023 | 28.34 | 
| Dec 1, 2022 | 28.32 | 
| Nov 1, 2022 | 28.38 | 
| Oct 1, 2022 | 27.08 | 
| Sep 1, 2022 | 28.23 | 
| Aug 1, 2022 | 30.70 | 
| Jul 1, 2022 | 29.00 | 
| Jun 1, 2022 | 29.05 | 
| May 1, 2022 | 30.67 | 
| Apr 1, 2022 | 33.89 | 
| Mar 1, 2022 | 34.27 | 
| Feb 1, 2022 | 35.29 | 
| Jan 1, 2022 | 36.94 | 
| Dec 1, 2021 | 38.31 | 
| Nov 1, 2021 | 38.58 | 
| Oct 1, 2021 | 37.25 | 
| Sep 1, 2021 | 37.62 | 
| Aug 1, 2021 | 37.97 | 
| Jul 1, 2021 | 37.44 | 
| Jun 1, 2021 | 36.70 | 
| May 1, 2021 | 36.55 | 
| Apr 1, 2021 | 36.72 | 
| Mar 1, 2021 | 35.04 | 
| Feb 1, 2021 | 35.10 | 
| Jan 1, 2021 | 34.51 | 
| Dec 1, 2020 | 33.77 | 
| Nov 1, 2020 | 32.47 | 
| Oct 1, 2020 | 31.28 | 
| Sep 1, 2020 | 30.84 | 
| Aug 1, 2020 | 31.16 | 
| Jul 1, 2020 | 29.60 | 
| Jun 1, 2020 | 28.84 | 
| May 1, 2020 | 27.33 | 
| Apr 1, 2020 | 25.93 | 
| Mar 1, 2020 | 24.82 | 
| Feb 1, 2020 | 30.73 | 
| Jan 1, 2020 | 30.99 | 
| Dec 1, 2019 | 30.33 | 
| Nov 1, 2019 | 29.84 | 
| Oct 1, 2019 | 28.84 | 
| Sep 1, 2019 | 29.23 | 
| Aug 1, 2019 | 28.71 | 
| Jul 1, 2019 | 29.99 | 
| Jun 1, 2019 | 29.28 | 
| May 1, 2019 | 29.24 | 
| Apr 1, 2019 | 30.13 | 
| Mar 1, 2019 | 29.58 | 
| Feb 1, 2019 | 29.54 | 
| Jan 1, 2019 | 28.38 | 
| Dec 1, 2018 | 28.29 | 
| Nov 1, 2018 | 30.20 | 
| Oct 1, 2018 | 31.04 | 
| Sep 1, 2018 | 32.62 | 
| Aug 1, 2018 | 32.39 | 
| Jul 1, 2018 | 31.89 | 
| Jun 1, 2018 | 31.63 | 
| May 1, 2018 | 31.24 | 
| Apr 1, 2018 | 30.97 | 
| Mar 1, 2018 | 31.81 | 
| Feb 1, 2018 | 32.04 | 
| Jan 1, 2018 | 33.31 | 
| Dec 1, 2017 | 32.09 | 
| Nov 1, 2017 | 31.30 | 
| Oct 1, 2017 | 30.92 | 
| Sep 1, 2017 | 30.17 | 
| Aug 1, 2017 | 29.91 | 
| Jul 1, 2017 | 30.00 | 
| Jun 1, 2017 | 29.75 | 
| May 1, 2017 | 29.31 | 
| Apr 1, 2017 | 28.90 | 
| Mar 1, 2017 | 29.09 | 
| Feb 1, 2017 | 28.66 | 
| Jan 1, 2017 | 28.06 | 
| Dec 1, 2016 | 27.87 | 
| Nov 1, 2016 | 26.85 | 
| Oct 1, 2016 | 26.53 | 
| Sep 1, 2016 | 26.73 | 
| Aug 1, 2016 | 26.95 | 
| Jul 1, 2016 | 26.69 | 
| Jun 1, 2016 | 25.84 | 
| May 1, 2016 | 25.69 | 
| Apr 1, 2016 | 25.92 | 
| Mar 1, 2016 | 25.37 | 
| Feb 1, 2016 | 24.00 | 
| Jan 1, 2016 | 24.21 | 
| Dec 1, 2015 | 25.97 | 
| Nov 1, 2015 | 26.23 | 
| Oct 1, 2015 | 25.49 | 
| Sep 1, 2015 | 24.50 | 
| Aug 1, 2015 | 25.69 | 
| Jul 1, 2015 | 26.38 | 
| Jun 1, 2015 | 26.50 | 
| May 1, 2015 | 26.81 | 
| Apr 1, 2015 | 26.79 | 
| Mar 1, 2015 | 26.73 | 
| Feb 1, 2015 | 27.00 | 
| Jan 1, 2015 | 26.49 | 
| Dec 1, 2014 | 26.79 | 
| Nov 1, 2014 | 26.61 | 
| Oct 1, 2014 | 25.16 | 
| Sep 1, 2014 | 25.92 | 
| Aug 1, 2014 | 25.62 | 
| Jul 1, 2014 | 25.82 | 
| Jun 1, 2014 | 25.56 | 
| May 1, 2014 | 24.94 | 
| Apr 1, 2014 | 24.79 | 
| Mar 1, 2014 | 24.96 | 
| Feb 1, 2014 | 24.59 | 
| Jan 1, 2014 | 24.86 | 
| Dec 1, 2013 | 24.86 | 
| Nov 1, 2013 | 24.64 | 
| Oct 1, 2013 | 23.83 | 
| Sep 1, 2013 | 23.44 | 
| Aug 1, 2013 | 23.36 | 
| Jul 1, 2013 | 23.49 | 
| Jun 1, 2013 | 22.93 | 
| May 1, 2013 | 23.41 | 
| Apr 1, 2013 | 22.60 | 
| Mar 1, 2013 | 22.42 | 
| Feb 1, 2013 | 22.05 | 
| Jan 1, 2013 | 21.90 | 
| Dec 1, 2012 | 21.24 | 
| Nov 1, 2012 | 20.90 | 
| Oct 1, 2012 | 21.58 | 
| Sep 1, 2012 | 21.78 | 
| Aug 1, 2012 | 21.41 | 
| Jul 1, 2012 | 21.00 | 
| Jun 1, 2012 | 20.55 | 
| May 1, 2012 | 20.94 | 
| Apr 1, 2012 | 21.78 | 
| Mar 1, 2012 | 22.05 | 
| Feb 1, 2012 | 21.80 | 
| Jan 1, 2012 | 21.21 | 
| Dec 1, 2011 | 20.52 | 
| Nov 1, 2011 | 20.35 | 
| Oct 1, 2011 | 20.16 | 
| Sep 1, 2011 | 19.70 | 
| Aug 1, 2011 | 20.05 | 
| Jul 1, 2011 | 22.61 | 
| Jun 1, 2011 | 22.10 | 
| May 1, 2011 | 23.06 | 
| Apr 1, 2011 | 23.14 | 
| Mar 1, 2011 | 22.90 | 
| Feb 1, 2011 | 23.49 | 
| Jan 1, 2011 | 22.98 | 
| Dec 1, 2010 | 22.40 | 
| Nov 1, 2010 | 21.70 | 
| Oct 1, 2010 | 21.24 | 
| Sep 1, 2010 | 20.38 | 
| Aug 1, 2010 | 19.77 | 
| Jul 1, 2010 | 19.67 | 
| Jun 1, 2010 | 19.74 | 
| May 1, 2010 | 20.48 | 
| Apr 1, 2010 | 21.80 | 
| Mar 1, 2010 | 21.00 | 
| Feb 1, 2010 | 19.92 | 
| Jan 1, 2010 | 20.53 | 
| Dec 1, 2009 | 20.32 | 
| Nov 1, 2009 | 19.81 | 
| Oct 1, 2009 | 19.36 | 
| Sep 1, 2009 | 18.83 | 
| Aug 1, 2009 | 18.09 | 
| Jul 1, 2009 | 16.69 | 
| Jun 1, 2009 | 16.38 | 
| May 1, 2009 | 16.00 | 
| Apr 1, 2009 | 14.98 | 
| Mar 1, 2009 | 13.32 | 
| Feb 1, 2009 | 14.12 | 
| Jan 1, 2009 | 15.17 | 
| Dec 1, 2008 | 15.38 | 
| Nov 1, 2008 | 15.26 | 
| Oct 1, 2008 | 16.39 | 
| Sep 1, 2008 | 20.36 | 
| Aug 1, 2008 | 21.40 | 
| Jul 1, 2008 | 20.91 | 
| Jun 1, 2008 | 22.42 | 
| May 1, 2008 | 23.70 | 
| Apr 1, 2008 | 23.36 | 
| Mar 1, 2008 | 22.61 | 
| Feb 1, 2008 | 23.50 | 
| Jan 1, 2008 | 24.02 | 
| Dec 1, 2007 | 25.96 | 
| Nov 1, 2007 | 25.73 | 
| Oct 1, 2007 | 27.32 | 
| Sep 1, 2007 | 26.73 | 
| Aug 1, 2007 | 26.15 | 
| Jul 1, 2007 | 27.41 | 
| Jun 1, 2007 | 27.42 | 
| May 1, 2007 | 27.55 | 
| Apr 1, 2007 | 26.98 | 
| Mar 1, 2007 | 26.23 | 
| Feb 1, 2007 | 27.32 | 
| Jan 1, 2007 | 27.21 | 
| Dec 1, 2006 | 27.28 | 
| Nov 1, 2006 | 26.93 | 
| Oct 1, 2006 | 26.54 | 
| Sep 1, 2006 | 25.64 | 
| Aug 1, 2006 | 25.05 | 
| Jul 1, 2006 | 24.70 | 
| Jun 1, 2006 | 24.75 | 
| May 1, 2006 | 25.65 | 
| Apr 1, 2006 | 26.15 | 
| Mar 1, 2006 | 26.33 | 
| Feb 1, 2006 | 26.25 | 
| Jan 1, 2006 | 26.47 | 
| Dec 1, 2005 | 26.44 | 
| Nov 1, 2005 | 25.93 | 
| Oct 1, 2005 | 24.88 | 
| Sep 1, 2005 | 25.73 | 
| Aug 1, 2005 | 26.10 | 
| Jul 1, 2005 | 26.29 | 
| Jun 1, 2005 | 26.07 | 
| May 1, 2005 | 25.65 | 
| Apr 1, 2005 | 25.41 | 
| Mar 1, 2005 | 26.34 | 
| Feb 1, 2005 | 26.74 | 
| Jan 1, 2005 | 26.59 | 
| Dec 1, 2004 | 27.14 | 
| Nov 1, 2004 | 26.47 | 
| Oct 1, 2004 | 25.41 | 
| Sep 1, 2004 | 25.67 | 
| Aug 1, 2004 | 25.17 | 
| Jul 1, 2004 | 25.70 | 
| Jun 1, 2004 | 26.40 | 
| May 1, 2004 | 25.90 | 
| Apr 1, 2004 | 26.90 | 
| Mar 1, 2004 | 26.89 | 
| Feb 1, 2004 | 27.65 | 
| Jan 1, 2004 | 27.66 | 
| Dec 1, 2003 | 26.64 | 
| Nov 1, 2003 | 25.95 | 
| Oct 1, 2003 | 25.68 | 
| Sep 1, 2003 | 25.24 | 
| Aug 1, 2003 | 24.64 | 
| Jul 1, 2003 | 24.87 | 
| Jun 1, 2003 | 24.83 | 
| May 1, 2003 | 23.59 | 
| Apr 1, 2003 | 22.43 | 
| Mar 1, 2003 | 21.31 | 
| Feb 1, 2003 | 21.21 | 
| Jan 1, 2003 | 22.90 | 
| Dec 1, 2002 | 23.10 | 
| Nov 1, 2002 | 23.35 | 
| Oct 1, 2002 | 21.96 | 
| Sep 1, 2002 | 22.36 | 
| Aug 1, 2002 | 23.59 | 
| Jul 1, 2002 | 23.46 | 
| Jun 1, 2002 | 26.39 | 
| May 1, 2002 | 28.13 | 
| Apr 1, 2002 | 29.01 | 
| Mar 1, 2002 | 30.29 | 
| Feb 1, 2002 | 29.09 | 
| Jan 1, 2002 | 30.28 | 
| Dec 1, 2001 | 30.50 | 
| Nov 1, 2001 | 30.01 | 
| Oct 1, 2001 | 28.58 | 
| Sep 1, 2001 | 27.67 | 
| Aug 1, 2001 | 31.40 | 
| Jul 1, 2001 | 32.16 | 
| Jun 1, 2001 | 33.07 | 
| May 1, 2001 | 34.07 | 
| Apr 1, 2001 | 32.17 | 
| Mar 1, 2001 | 32.32 | 
| Feb 1, 2001 | 35.83 | 
| Jan 1, 2001 | 36.98 | 
| Dec 1, 2000 | 37.27 | 
| Nov 1, 2000 | 38.78 | 
| Oct 1, 2000 | 39.37 | 
| Sep 1, 2000 | 41.89 | 
| Aug 1, 2000 | 42.87 | 
| Jul 1, 2000 | 42.75 | 
| Jun 1, 2000 | 42.78 | 
| May 1, 2000 | 41.96 | 
| Apr 1, 2000 | 43.53 | 
| Mar 1, 2000 | 43.22 | 
| Feb 1, 2000 | 42.18 | 
| Jan 1, 2000 | 43.77 | 
| Dec 1, 1999 | 44.19 | 
| Nov 1, 1999 | 43.21 | 
| Oct 1, 1999 | 40.55 | 
| Sep 1, 1999 | 41.32 | 
| Aug 1, 1999 | 41.93 | 
| Jul 1, 1999 | 43.83 | 
| Jun 1, 1999 | 42.18 | 
| May 1, 1999 | 42.55 | 
| Apr 1, 1999 | 42.70 | 
| Mar 1, 1999 | 41.35 | 
| Feb 1, 1999 | 40.40 | 
| Jan 1, 1999 | 40.57 | 
| Dec 1, 1998 | 38.82 | 
| Nov 1, 1998 | 37.37 | 
| Oct 1, 1998 | 33.77 | 
| Sep 1, 1998 | 33.53 | 
| Aug 1, 1998 | 35.42 | 
| Jul 1, 1998 | 38.26 | 
| Jun 1, 1998 | 36.80 | 
| May 1, 1998 | 36.95 | 
| Apr 1, 1998 | 37.27 | 
| Mar 1, 1998 | 36.29 | 
| Feb 1, 1998 | 34.71 | 
| Jan 1, 1998 | 32.86 | 
| Dec 1, 1997 | 33.03 | 
| Nov 1, 1997 | 32.33 | 
| Oct 1, 1997 | 32.90 | 
| Sep 1, 1997 | 32.66 | 
| Aug 1, 1997 | 32.58 | 
| Jul 1, 1997 | 32.76 | 
| Jun 1, 1997 | 31.25 | 
| May 1, 1997 | 29.93 | 
| Apr 1, 1997 | 27.58 | 
| Mar 1, 1997 | 28.80 | 
| Feb 1, 1997 | 29.26 | 
| Jan 1, 1997 | 28.33 | 
| Dec 1, 1996 | 27.72 | 
| Nov 1, 1996 | 27.58 | 
| Oct 1, 1996 | 26.48 | 
| Sep 1, 1996 | 25.68 | 
| Aug 1, 1996 | 25.41 | 
| Jul 1, 1996 | 24.86 | 
| Jun 1, 1996 | 25.96 | 
| May 1, 1996 | 25.81 | 
| Apr 1, 1996 | 25.42 | 
| Mar 1, 1996 | 25.63 | 
| Feb 1, 1996 | 25.97 | 
| Jan 1, 1996 | 24.76 | 
| Dec 1, 1995 | 25.03 | 
| Nov 1, 1995 | 24.35 | 
| Oct 1, 1995 | 23.93 | 
| Sep 1, 1995 | 23.94 | 
| Aug 1, 1995 | 23.28 | 
| Jul 1, 1995 | 23.37 | 
| Jun 1, 1995 | 22.72 | 
| May 1, 1995 | 22.19 | 
| Apr 1, 1995 | 21.64 | 
| Mar 1, 1995 | 21.15 | 
| Feb 1, 1995 | 20.80 | 
| Jan 1, 1995 | 20.22 | 
| Dec 1, 1994 | 19.91 | 
| Nov 1, 1994 | 20.21 | 
| Oct 1, 1994 | 20.39 | 
| Sep 1, 1994 | 20.57 | 
| Aug 1, 1994 | 20.53 | 
| Jul 1, 1994 | 20.07 | 
| Jun 1, 1994 | 20.29 | 
| May 1, 1994 | 20.19 | 
| Apr 1, 1994 | 20.05 | 
| Mar 1, 1994 | 20.83 | 
| Feb 1, 1994 | 21.26 | 
| Jan 1, 1994 | 21.41 | 
| Dec 1, 1993 | 21.16 | 
| Nov 1, 1993 | 21.04 | 
| Oct 1, 1993 | 21.11 | 
| Sep 1, 1993 | 20.99 | 
| Aug 1, 1993 | 20.81 | 
| Jul 1, 1993 | 20.56 | 
| Jun 1, 1993 | 20.61 | 
| May 1, 1993 | 20.52 | 
| Apr 1, 1993 | 20.46 | 
| Mar 1, 1993 | 20.85 | 
| Feb 1, 1993 | 20.54 | 
| Jan 1, 1993 | 20.32 | 
| Dec 1, 1992 | 20.45 | 
| Nov 1, 1992 | 19.83 | 
| Oct 1, 1992 | 19.37 | 
| Sep 1, 1992 | 19.71 | 
| Aug 1, 1992 | 19.72 | 
| Jul 1, 1992 | 19.62 | 
| Jun 1, 1992 | 19.31 | 
| May 1, 1992 | 19.66 | 
| Apr 1, 1992 | 19.30 | 
| Mar 1, 1992 | 19.28 | 
| Feb 1, 1992 | 19.58 | 
| Jan 1, 1992 | 19.77 | 
| Dec 1, 1991 | 18.44 | 
| Nov 1, 1991 | 18.29 | 
| Oct 1, 1991 | 18.35 | 
| Sep 1, 1991 | 18.36 | 
| Aug 1, 1991 | 18.51 | 
| Jul 1, 1991 | 18.10 | 
| Jun 1, 1991 | 18.01 | 
| May 1, 1991 | 18.03 | 
| Apr 1, 1991 | 18.16 | 
| Mar 1, 1991 | 17.82 | 
| Feb 1, 1991 | 17.36 | 
| Jan 1, 1991 | 15.61 | 
| Dec 1, 1990 | 15.85 | 
| Nov 1, 1990 | 15.19 | 
| Oct 1, 1990 | 14.82 | 
| Sep 1, 1990 | 15.30 | 
| Aug 1, 1990 | 16.17 | 
| Jul 1, 1990 | 17.75 | 
| Jun 1, 1990 | 17.82 | 
| May 1, 1990 | 17.39 | 
| Apr 1, 1990 | 16.81 | 
| Mar 1, 1990 | 16.83 | 
| Feb 1, 1990 | 16.51 | 
| Jan 1, 1990 | 17.05 | 
| Dec 1, 1989 | 17.65 | 
| Nov 1, 1989 | 17.24 | 
| Oct 1, 1989 | 17.64 | 
| Sep 1, 1989 | 17.71 | 
| Aug 1, 1989 | 17.73 | 
| Jul 1, 1989 | 17.01 | 
| Jun 1, 1989 | 16.64 | 
| May 1, 1989 | 16.19 | 
| Apr 1, 1989 | 15.69 | 
| Mar 1, 1989 | 15.30 | 
| Feb 1, 1989 | 15.47 | 
| Jan 1, 1989 | 15.09 | 
| Dec 1, 1988 | 14.70 | 
| Nov 1, 1988 | 14.45 | 
| Oct 1, 1988 | 14.81 | 
| Sep 1, 1988 | 14.37 | 
| Aug 1, 1988 | 14.24 | 
| Jul 1, 1988 | 14.61 | 
| Jun 1, 1988 | 14.77 | 
| May 1, 1988 | 14.03 | 
| Apr 1, 1988 | 14.43 | 
| Mar 1, 1988 | 14.67 | 
| Feb 1, 1988 | 14.30 | 
| Jan 1, 1988 | 13.90 | 
| Dec 1, 1987 | 13.39 | 
| Nov 1, 1987 | 13.59 | 
| Oct 1, 1987 | 15.53 | 
| Sep 1, 1987 | 17.68 | 
| Aug 1, 1987 | 18.33 | 
| Jul 1, 1987 | 17.31 | 
| Jun 1, 1987 | 16.83 | 
| May 1, 1987 | 16.16 | 
| Apr 1, 1987 | 16.20 | 
| Mar 1, 1987 | 16.43 | 
| Feb 1, 1987 | 15.82 | 
| Jan 1, 1987 | 14.92 | 
| Dec 1, 1986 | 14.09 | 
| Nov 1, 1986 | 13.87 | 
| Oct 1, 1986 | 13.43 | 
| Sep 1, 1986 | 13.47 | 
| Aug 1, 1986 | 13.89 | 
| Jul 1, 1986 | 13.62 | 
| Jun 1, 1986 | 13.89 | 
| May 1, 1986 | 13.56 | 
| Apr 1, 1986 | 13.55 | 
| Mar 1, 1986 | 13.19 | 
| Feb 1, 1986 | 12.39 | 
| Jan 1, 1986 | 11.72 | 
| Dec 1, 1985 | 11.69 | 
| Nov 1, 1985 | 11.16 | 
| Oct 1, 1985 | 10.55 | 
| Sep 1, 1985 | 10.47 | 
| Aug 1, 1985 | 10.74 | 
| Jul 1, 1985 | 11.00 | 
| Jun 1, 1985 | 10.81 | 
| May 1, 1985 | 10.61 | 
| Apr 1, 1985 | 10.40 | 
| Mar 1, 1985 | 10.37 | 
| Feb 1, 1985 | 10.49 | 
| Jan 1, 1985 | 10.00 | 
| Dec 1, 1984 | 9.60 | 
| Nov 1, 1984 | 9.69 | 
| Oct 1, 1984 | 9.60 | 
| Sep 1, 1984 | 9.69 | 
| Aug 1, 1984 | 9.62 | 
| Jul 1, 1984 | 8.87 | 
| Jun 1, 1984 | 9.01 | 
| May 1, 1984 | 9.23 | 
| Apr 1, 1984 | 9.31 | 
| Mar 1, 1984 | 9.33 | 
| Feb 1, 1984 | 9.32 | 
| Jan 1, 1984 | 9.89 | 
| Dec 1, 1983 | 9.82 | 
| Nov 1, 1983 | 9.85 | 
| Oct 1, 1983 | 10.00 | 
| Sep 1, 1983 | 9.98 | 
| Aug 1, 1983 | 9.73 | 
| Jul 1, 1983 | 10.01 | 
| Jun 1, 1983 | 10.00 | 
| May 1, 1983 | 9.87 | 
| Apr 1, 1983 | 9.53 | 
| Mar 1, 1983 | 9.23 | 
| Feb 1, 1983 | 8.91 | 
| Jan 1, 1983 | 8.76 | 
| Dec 1, 1982 | 8.47 | 
| Nov 1, 1982 | 8.35 | 
| Oct 1, 1982 | 8.00 | 
| Sep 1, 1982 | 7.40 | 
| Aug 1, 1982 | 6.64 | 
| Jul 1, 1982 | 6.64 | 
| Jun 1, 1982 | 6.69 | 
| May 1, 1982 | 7.19 | 
| Apr 1, 1982 | 7.26 | 
| Mar 1, 1982 | 6.95 | 
| Feb 1, 1982 | 7.18 | 
| Jan 1, 1982 | 7.39 | 
| Dec 1, 1981 | 7.83 | 
| Nov 1, 1981 | 7.81 | 
| Oct 1, 1981 | 7.65 | 
| Sep 1, 1981 | 7.58 | 
| Aug 1, 1981 | 8.40 | 
| Jul 1, 1981 | 8.45 | 
| Jun 1, 1981 | 8.77 | 
| May 1, 1981 | 8.82 | 
| Apr 1, 1981 | 9.09 | 
| Mar 1, 1981 | 9.08 | 
| Feb 1, 1981 | 8.83 | 
| Jan 1, 1981 | 9.26 | 
| Dec 1, 1980 | 9.39 | 
| Nov 1, 1980 | 9.65 | 
| Oct 1, 1980 | 9.36 | 
| Sep 1, 1980 | 9.20 | 
| Aug 1, 1980 | 9.07 | 
| Jul 1, 1980 | 8.88 | 
| Jun 1, 1980 | 8.51 | 
| May 1, 1980 | 8.10 | 
| Apr 1, 1980 | 7.84 | 
| Mar 1, 1980 | 8.08 | 
| Feb 1, 1980 | 9.05 | 
| Jan 1, 1980 | 8.85 | 
| Dec 1, 1979 | 8.75 | 
| Nov 1, 1979 | 8.52 | 
| Oct 1, 1979 | 8.68 | 
| Sep 1, 1979 | 9.11 | 
| Aug 1, 1979 | 9.13 | 
| Jul 1, 1979 | 8.83 | 
| Jun 1, 1979 | 8.85 | 
| May 1, 1979 | 8.79 | 
| Apr 1, 1979 | 9.13 | 
| Mar 1, 1979 | 9.07 | 
| Feb 1, 1979 | 9.00 | 
| Jan 1, 1979 | 9.26 | 
| Dec 1, 1978 | 9.01 | 
| Nov 1, 1978 | 8.93 | 
| Oct 1, 1978 | 9.53 | 
| Sep 1, 1978 | 9.94 | 
| Aug 1, 1978 | 10.02 | 
| Jul 1, 1978 | 9.43 | 
| Jun 1, 1978 | 9.55 | 
| May 1, 1978 | 9.63 | 
| Apr 1, 1978 | 9.26 | 
| Mar 1, 1978 | 8.95 | 
| Feb 1, 1978 | 9.05 | 
| Jan 1, 1978 | 9.24 | 
| Dec 1, 1977 | 9.68 | 
| Nov 1, 1977 | 9.77 | 
| Oct 1, 1977 | 9.77 | 
| Sep 1, 1977 | 10.07 | 
| Aug 1, 1977 | 10.27 | 
| Jul 1, 1977 | 10.57 | 
| Jun 1, 1977 | 10.53 | 
| May 1, 1977 | 10.55 | 
| Apr 1, 1977 | 10.64 | 
| Mar 1, 1977 | 10.90 | 
| Feb 1, 1977 | 11.01 | 
| Jan 1, 1977 | 11.44 | 
| Dec 1, 1976 | 11.60 | 
| Nov 1, 1976 | 11.25 | 
| Oct 1, 1976 | 11.35 | 
| Sep 1, 1976 | 11.81 | 
| Aug 1, 1976 | 11.60 | 
| Jul 1, 1976 | 11.76 | 
| Jun 1, 1976 | 11.54 | 
| May 1, 1976 | 11.53 | 
| Apr 1, 1976 | 11.69 | 
| Mar 1, 1976 | 11.63 | 
| Feb 1, 1976 | 11.59 | 
| Jan 1, 1976 | 11.19 | 
| Dec 1, 1975 | 10.25 | 
| Nov 1, 1975 | 10.44 | 
| Oct 1, 1975 | 10.33 | 
| Sep 1, 1975 | 9.92 | 
| Aug 1, 1975 | 10.09 | 
| Jul 1, 1975 | 10.90 | 
| Jun 1, 1975 | 11.01 | 
| May 1, 1975 | 10.82 | 
| Apr 1, 1975 | 10.23 | 
| Mar 1, 1975 | 10.16 | 
| Feb 1, 1975 | 9.76 | 
| Jan 1, 1975 | 8.92 | 
| Dec 1, 1974 | 8.29 | 
| Nov 1, 1974 | 8.95 | 
| Oct 1, 1974 | 8.74 | 
| Sep 1, 1974 | 8.68 | 
| Aug 1, 1974 | 9.82 | 
| Jul 1, 1974 | 10.39 | 
| Jun 1, 1974 | 11.89 | 
| May 1, 1974 | 12.00 | 
| Apr 1, 1974 | 12.55 | 
| Mar 1, 1974 | 13.31 | 
| Feb 1, 1974 | 12.96 | 
| Jan 1, 1974 | 13.53 | 
| Dec 1, 1973 | 13.49 | 
| Nov 1, 1973 | 14.65 | 
| Oct 1, 1973 | 15.91 | 
| Sep 1, 1973 | 15.48 | 
| Aug 1, 1973 | 15.28 | 
| Jul 1, 1973 | 15.89 | 
| Jun 1, 1973 | 15.81 | 
| May 1, 1973 | 16.31 | 
| Apr 1, 1973 | 16.94 | 
| Mar 1, 1973 | 17.41 | 
| Feb 1, 1973 | 17.89 | 
| Jan 1, 1973 | 18.71 | 
| Dec 1, 1972 | 18.65 | 
| Nov 1, 1972 | 18.34 | 
| Oct 1, 1972 | 17.53 | 
| Sep 1, 1972 | 17.61 | 
| Aug 1, 1972 | 17.94 | 
| Jul 1, 1972 | 17.40 | 
| Jun 1, 1972 | 17.64 | 
| May 1, 1972 | 17.66 | 
| Apr 1, 1972 | 17.92 | 
| Mar 1, 1972 | 17.81 | 
| Feb 1, 1972 | 17.46 | 
| Jan 1, 1972 | 17.26 | 
| Dec 1, 1971 | 16.60 | 
| Nov 1, 1971 | 15.64 | 
| Oct 1, 1971 | 16.43 | 
| Sep 1, 1971 | 16.86 | 
| Aug 1, 1971 | 16.52 | 
| Jul 1, 1971 | 16.89 | 
| Jun 1, 1971 | 17.08 | 
| May 1, 1971 | 17.56 | 
| Apr 1, 1971 | 17.92 | 
| Mar 1, 1971 | 17.40 | 
| Feb 1, 1971 | 17.03 | 
| Jan 1, 1971 | 16.46 | 
| Dec 1, 1970 | 15.87 | 
| Nov 1, 1970 | 14.95 | 
| Oct 1, 1970 | 15.06 | 
| Sep 1, 1970 | 14.84 | 
| Aug 1, 1970 | 14.10 | 
| Jul 1, 1970 | 13.73 | 
| Jun 1, 1970 | 13.80 | 
| May 1, 1970 | 13.98 | 
| Apr 1, 1970 | 15.87 | 
| Mar 1, 1970 | 16.53 | 
| Feb 1, 1970 | 16.37 | 
| Jan 1, 1970 | 17.09 | 
| Dec 1, 1969 | 17.33 | 
| Nov 1, 1969 | 18.44 | 
| Oct 1, 1969 | 18.45 | 
| Sep 1, 1969 | 18.40 | 
| Aug 1, 1969 | 18.43 | 
| Jul 1, 1969 | 18.68 | 
| Jun 1, 1969 | 19.71 | 
| May 1, 1969 | 20.97 | 
| Apr 1, 1969 | 20.43 | 
| Mar 1, 1969 | 20.20 | 
| Feb 1, 1969 | 20.90 | 
| Jan 1, 1969 | 21.19 | 
| Dec 1, 1968 | 22.28 | 
| Nov 1, 1968 | 22.20 | 
| Oct 1, 1968 | 22.00 | 
| Sep 1, 1968 | 21.68 | 
| Aug 1, 1968 | 21.14 | 
| Jul 1, 1968 | 21.75 | 
| Jun 1, 1968 | 22.00 | 
| May 1, 1968 | 21.63 | 
| Apr 1, 1968 | 21.28 | 
| Mar 1, 1968 | 19.93 | 
| Feb 1, 1968 | 20.42 | 
| Jan 1, 1968 | 21.51 | 
| Dec 1, 1967 | 21.75 | 
| Nov 1, 1967 | 21.26 | 
| Oct 1, 1967 | 22.07 | 
| Sep 1, 1967 | 22.22 | 
| Aug 1, 1967 | 22.03 | 
| Jul 1, 1967 | 21.80 | 
| Jun 1, 1967 | 21.55 | 
| May 1, 1967 | 21.95 | 
| Apr 1, 1967 | 21.69 | 
| Mar 1, 1967 | 21.44 | 
| Feb 1, 1967 | 21.07 | 
| Jan 1, 1967 | 20.43 | 
| Dec 1, 1966 | 19.74 | 
| Nov 1, 1966 | 19.71 | 
| Oct 1, 1966 | 18.83 | 
| Sep 1, 1966 | 19.16 | 
| Aug 1, 1966 | 19.91 | 
| Jul 1, 1966 | 21.38 | 
| Jun 1, 1966 | 21.56 | 
| May 1, 1966 | 21.85 | 
| Apr 1, 1966 | 23.11 | 
| Mar 1, 1966 | 22.61 | 
| Feb 1, 1966 | 23.70 | 
| Jan 1, 1966 | 24.06 | 
| Dec 1, 1965 | 23.69 | 
| Nov 1, 1965 | 23.93 | 
| Oct 1, 1965 | 23.78 | 
| Sep 1, 1965 | 23.37 | 
| Aug 1, 1965 | 22.67 | 
| Jul 1, 1965 | 22.30 | 
| Jun 1, 1965 | 22.39 | 
| May 1, 1965 | 23.71 | 
| Apr 1, 1965 | 23.42 | 
| Mar 1, 1965 | 23.25 | 
| Feb 1, 1965 | 23.37 | 
| Jan 1, 1965 | 23.27 | 
| Dec 1, 1964 | 22.75 | 
| Nov 1, 1964 | 23.23 | 
| Oct 1, 1964 | 23.21 | 
| Sep 1, 1964 | 22.89 | 
| Aug 1, 1964 | 22.65 | 
| Jul 1, 1964 | 22.98 | 
| Jun 1, 1964 | 22.30 | 
| May 1, 1964 | 22.57 | 
| Apr 1, 1964 | 22.42 | 
| Mar 1, 1964 | 22.17 | 
| Feb 1, 1964 | 21.83 | 
| Jan 1, 1964 | 21.63 | 
| Dec 1, 1963 | 21.04 | 
| Nov 1, 1963 | 20.72 | 
| Oct 1, 1963 | 20.89 | 
| Sep 1, 1963 | 20.96 | 
| Aug 1, 1963 | 20.47 | 
| Jul 1, 1963 | 19.97 | 
| Jun 1, 1963 | 20.38 | 
| May 1, 1963 | 20.51 | 
| Apr 1, 1963 | 20.15 | 
| Mar 1, 1963 | 19.29 | 
| Feb 1, 1963 | 19.47 | 
| Jan 1, 1963 | 19.26 | 
| Dec 1, 1962 | 18.59 | 
| Nov 1, 1962 | 17.85 | 
| Oct 1, 1962 | 16.74 | 
| Sep 1, 1962 | 17.32 | 
| Aug 1, 1962 | 17.57 | 
| Jul 1, 1962 | 17.14 | 
| Jun 1, 1962 | 16.83 | 
| May 1, 1962 | 19.09 | 
| Apr 1, 1962 | 20.66 | 
| Mar 1, 1962 | 21.44 | 
| Feb 1, 1962 | 21.45 | 
| Jan 1, 1962 | 21.20 | 
| Dec 1, 1961 | 22.04 | 
| Nov 1, 1961 | 21.86 | 
| Oct 1, 1961 | 20.92 | 
| Sep 1, 1961 | 20.71 | 
| Aug 1, 1961 | 20.94 | 
| Jul 1, 1961 | 20.15 | 
| Jun 1, 1961 | 20.33 | 
| May 1, 1961 | 20.60 | 
| Apr 1, 1961 | 20.38 | 
| Mar 1, 1961 | 19.84 | 
| Feb 1, 1961 | 19.23 | 
| Jan 1, 1961 | 18.47 | 
| Dec 1, 1960 | 17.56 | 
| Nov 1, 1960 | 17.15 | 
| Oct 1, 1960 | 16.61 | 
| Sep 1, 1960 | 17.05 | 
| Aug 1, 1960 | 17.58 | 
| Jul 1, 1960 | 17.38 | 
| Jun 1, 1960 | 17.82 | 
| May 1, 1960 | 17.26 | 
| Apr 1, 1960 | 17.43 | 
| Mar 1, 1960 | 17.29 | 
| Feb 1, 1960 | 17.55 | 
| Jan 1, 1960 | 18.34 | 
| Dec 1, 1959 | 18.62 | 
| Nov 1, 1959 | 18.07 | 
| Oct 1, 1959 | 18.02 | 
| Sep 1, 1959 | 18.12 | 
| Aug 1, 1959 | 18.96 | 
| Jul 1, 1959 | 19.09 | 
| Jun 1, 1959 | 18.45 | 
| May 1, 1959 | 18.69 | 
| Apr 1, 1959 | 18.43 | 
| Mar 1, 1959 | 18.20 | 
| Feb 1, 1959 | 17.76 | 
| Jan 1, 1959 | 17.98 | 
| Dec 1, 1958 | 17.36 | 
| Nov 1, 1958 | 16.99 | 
| Oct 1, 1958 | 16.56 | 
| Sep 1, 1958 | 15.93 | 
| Aug 1, 1958 | 15.54 | 
| Jul 1, 1958 | 14.96 | 
| Jun 1, 1958 | 14.64 | 
| May 1, 1958 | 14.32 | 
| Apr 1, 1958 | 13.91 | 
| Mar 1, 1958 | 13.93 | 
| Feb 1, 1958 | 13.78 | 
| Jan 1, 1958 | 13.79 | 
| Dec 1, 1957 | 13.67 | 
| Nov 1, 1957 | 13.74 | 
| Oct 1, 1957 | 14.15 | 
| Sep 1, 1957 | 15.16 | 
| Aug 1, 1957 | 15.87 | 
| Jul 1, 1957 | 16.87 | 
| Jun 1, 1957 | 16.73 | 
| May 1, 1957 | 16.60 | 
| Apr 1, 1957 | 16.12 | 
| Mar 1, 1957 | 15.90 | 
| Feb 1, 1957 | 15.84 | 
| Jan 1, 1957 | 16.72 | 
| Dec 1, 1956 | 17.20 | 
| Nov 1, 1956 | 17.12 | 
| Oct 1, 1956 | 17.42 | 
| Sep 1, 1956 | 17.84 | 
| Aug 1, 1956 | 18.67 | 
| Jul 1, 1956 | 18.86 | 
| Jun 1, 1956 | 18.16 | 
| May 1, 1956 | 18.54 | 
| Apr 1, 1956 | 19.37 | 
| Mar 1, 1956 | 19.37 | 
| Feb 1, 1956 | 18.27 | 
| Jan 1, 1956 | 18.29 | 
| Dec 1, 1955 | 18.94 | 
| Nov 1, 1955 | 18.84 | 
| Oct 1, 1955 | 17.77 | 
| Sep 1, 1955 | 18.84 | 
| Aug 1, 1955 | 18.22 | 
| Jul 1, 1955 | 18.45 | 
| Jun 1, 1955 | 17.37 | 
| May 1, 1955 | 16.52 | 
| Apr 1, 1955 | 16.69 | 
| Mar 1, 1955 | 16.22 | 
| Feb 1, 1955 | 16.44 | 
| Jan 1, 1955 | 15.99 | 
| Dec 1, 1954 | 15.79 | 
| Nov 1, 1954 | 15.12 | 
| Oct 1, 1954 | 14.62 | 
| Sep 1, 1954 | 14.36 | 
| Aug 1, 1954 | 14.04 | 
| Jul 1, 1954 | 13.83 | 
| Jun 1, 1954 | 13.36 | 
| May 1, 1954 | 13.31 | 
| Apr 1, 1954 | 12.91 | 
| Mar 1, 1954 | 12.42 | 
| Feb 1, 1954 | 12.22 | 
| Jan 1, 1954 | 12.00 | 
| Dec 1, 1953 | 11.75 | 
| Nov 1, 1953 | 11.64 | 
| Oct 1, 1953 | 11.39 | 
| Sep 1, 1953 | 11.14 | 
| Aug 1, 1953 | 11.72 | 
| Jul 1, 1953 | 11.75 | 
| Jun 1, 1953 | 11.62 | 
| May 1, 1953 | 12.14 | 
| Apr 1, 1953 | 12.16 | 
| Mar 1, 1953 | 12.83 | 
| Feb 1, 1953 | 12.86 | 
| Jan 1, 1953 | 13.01 | 
| Dec 1, 1952 | 12.93 | 
| Nov 1, 1952 | 12.47 | 
| Oct 1, 1952 | 12.13 | 
| Sep 1, 1952 | 12.43 | 
| Aug 1, 1952 | 12.68 | 
| Jul 1, 1952 | 12.67 | 
| Jun 1, 1952 | 12.45 | 
| May 1, 1952 | 12.20 | 
| Apr 1, 1952 | 12.24 | 
| Mar 1, 1952 | 12.36 | 
| Feb 1, 1952 | 12.36 | 
| Jan 1, 1952 | 12.53 | 
| Dec 1, 1951 | 12.15 | 
| Nov 1, 1951 | 11.85 | 
| Oct 1, 1951 | 12.31 | 
| Sep 1, 1951 | 12.44 | 
| Aug 1, 1951 | 12.26 | 
| Jul 1, 1951 | 11.78 | 
| Jun 1, 1951 | 11.62 | 
| May 1, 1951 | 11.86 | 
| Apr 1, 1951 | 11.95 | 
| Mar 1, 1951 | 11.84 | 
| Feb 1, 1951 | 12.14 | 
| Jan 1, 1951 | 11.90 | 
| Dec 1, 1950 | 11.31 | 
| Nov 1, 1950 | 11.54 | 
| Oct 1, 1950 | 11.66 | 
| Sep 1, 1950 | 11.34 | 
| Aug 1, 1950 | 11.04 | 
| Jul 1, 1950 | 10.54 | 
| Jun 1, 1950 | 11.55 | 
| May 1, 1950 | 11.46 | 
| Apr 1, 1950 | 11.18 | 
| Mar 1, 1950 | 10.91 | 
| Feb 1, 1950 | 10.91 | 
| Jan 1, 1950 | 10.75 | 
| Dec 1, 1949 | 10.53 | 
| Nov 1, 1949 | 10.22 | 
| Oct 1, 1949 | 10.17 | 
| Sep 1, 1949 | 9.88 | 
| Aug 1, 1949 | 9.85 | 
| Jul 1, 1949 | 9.61 | 
| Jun 1, 1949 | 9.07 | 
| May 1, 1949 | 9.69 | 
| Apr 1, 1949 | 9.78 | 
| Mar 1, 1949 | 9.90 | 
| Feb 1, 1949 | 9.87 | 
| Jan 1, 1949 | 10.25 | 
| Dec 1, 1948 | 10.16 | 
| Nov 1, 1948 | 10.25 | 
| Oct 1, 1948 | 10.83 | 
| Sep 1, 1948 | 10.55 | 
| Aug 1, 1948 | 10.72 | 
| Jul 1, 1948 | 11.13 | 
| Jun 1, 1948 | 11.58 | 
| May 1, 1948 | 11.24 | 
| Apr 1, 1948 | 10.78 | 
| Mar 1, 1948 | 10.19 | 
| Feb 1, 1948 | 10.00 | 
| Jan 1, 1948 | 10.42 | 
| Dec 1, 1947 | 10.68 | 
| Nov 1, 1947 | 10.98 | 
| Oct 1, 1947 | 11.13 | 
| Sep 1, 1947 | 10.83 | 
| Aug 1, 1947 | 11.34 | 
| Jul 1, 1947 | 11.70 | 
| Jun 1, 1947 | 11.08 | 
| May 1, 1947 | 10.73 | 
| Apr 1, 1947 | 10.90 | 
| Mar 1, 1947 | 11.29 | 
| Feb 1, 1947 | 11.95 | 
| Jan 1, 1947 | 11.47 | 
| Dec 1, 1946 | 11.37 | 
| Nov 1, 1946 | 11.11 | 
| Oct 1, 1946 | 11.39 | 
| Sep 1, 1946 | 11.84 | 
| Aug 1, 1946 | 13.98 | 
| Jul 1, 1946 | 14.51 | 
| Jun 1, 1946 | 15.77 | 
| May 1, 1946 | 16.01 | 
| Apr 1, 1946 | 16.04 | 
| Mar 1, 1946 | 15.13 | 
| Feb 1, 1946 | 15.76 | 
| Jan 1, 1946 | 15.62 | 
| Dec 1, 1945 | 15.02 | 
| Nov 1, 1945 | 14.85 | 
| Oct 1, 1945 | 14.37 | 
| Sep 1, 1945 | 13.80 | 
| Aug 1, 1945 | 12.92 | 
| Jul 1, 1945 | 12.87 | 
| Jun 1, 1945 | 13.13 | 
| May 1, 1945 | 13.04 | 
| Apr 1, 1945 | 12.63 | 
| Mar 1, 1945 | 12.32 | 
| Feb 1, 1945 | 12.34 | 
| Jan 1, 1945 | 11.96 | 
| Dec 1, 1944 | 11.64 | 
| Nov 1, 1944 | 11.48 | 
| Oct 1, 1944 | 11.58 | 
| Sep 1, 1944 | 11.33 | 
| Aug 1, 1944 | 11.54 | 
| Jul 1, 1944 | 11.74 | 
| Jun 1, 1944 | 11.53 | 
| May 1, 1944 | 11.10 | 
| Apr 1, 1944 | 10.94 | 
| Mar 1, 1944 | 11.22 | 
| Feb 1, 1944 | 10.95 | 
| Jan 1, 1944 | 11.05 | 
| Dec 1, 1943 | 10.74 | 
| Nov 1, 1943 | 10.63 | 
| Oct 1, 1943 | 11.19 | 
| Sep 1, 1943 | 11.34 | 
| Aug 1, 1943 | 11.21 | 
| Jul 1, 1943 | 11.77 | 
| Jun 1, 1943 | 11.52 | 
| May 1, 1943 | 11.36 | 
| Apr 1, 1943 | 11.04 | 
| Mar 1, 1943 | 10.85 | 
| Feb 1, 1943 | 10.71 | 
| Jan 1, 1943 | 10.15 | 
| Dec 1, 1942 | 9.62 | 
| Nov 1, 1942 | 9.66 | 
| Oct 1, 1942 | 9.60 | 
| Sep 1, 1942 | 9.08 | 
| Aug 1, 1942 | 9.01 | 
| Jul 1, 1942 | 9.15 | 
| Jun 1, 1942 | 8.91 | 
| May 1, 1942 | 8.51 | 
| Apr 1, 1942 | 8.54 | 
| Mar 1, 1942 | 9.00 | 
| Feb 1, 1942 | 9.68 | 
| Jan 1, 1942 | 10.10 | 
| Dec 1, 1941 | 10.09 | 
| Nov 1, 1941 | 10.91 | 
| Oct 1, 1941 | 11.58 | 
| Sep 1, 1941 | 12.28 | 
| Aug 1, 1941 | 12.46 | 
| Jul 1, 1941 | 12.74 | 
| Jun 1, 1941 | 12.16 | 
| May 1, 1941 | 12.04 | 
| Apr 1, 1941 | 12.43 | 
| Mar 1, 1941 | 12.96 | 
| Feb 1, 1941 | 13.00 | 
| Jan 1, 1941 | 13.90 | 
| Dec 1, 1940 | 13.91 | 
| Nov 1, 1940 | 14.64 | 
| Oct 1, 1940 | 14.33 | 
| Sep 1, 1940 | 14.21 | 
| Aug 1, 1940 | 13.65 | 
| Jul 1, 1940 | 13.37 | 
| Jun 1, 1940 | 12.84 | 
| May 1, 1940 | 14.14 | 
| Apr 1, 1940 | 16.37 | 
| Mar 1, 1940 | 16.17 | 
| Feb 1, 1940 | 16.22 | 
| Jan 1, 1940 | 16.38 | 
| Dec 1, 1939 | 16.28 | 
| Nov 1, 1939 | 16.60 | 
| Oct 1, 1939 | 16.82 | 
| Sep 1, 1939 | 16.45 | 
| Aug 1, 1939 | 15.12 | 
| Jul 1, 1939 | 15.27 | 
| Jun 1, 1939 | 14.83 | 
| May 1, 1939 | 14.50 | 
| Apr 1, 1939 | 13.92 | 
| Mar 1, 1939 | 15.73 | 
| Feb 1, 1939 | 15.66 | 
| Jan 1, 1939 | 15.60 | 
| Dec 1, 1938 | 15.76 | 
| Nov 1, 1938 | 16.15 | 
| Oct 1, 1938 | 16.06 | 
| Sep 1, 1938 | 14.28 | 
| Aug 1, 1938 | 14.90 | 
| Jul 1, 1938 | 14.77 | 
| Jun 1, 1938 | 12.29 | 
| May 1, 1938 | 11.99 | 
| Apr 1, 1938 | 11.79 | 
| Mar 1, 1938 | 12.38 | 
| Feb 1, 1938 | 13.26 | 
| Jan 1, 1938 | 13.51 | 
| Dec 1, 1937 | 13.01 | 
| Nov 1, 1937 | 13.16 | 
| Oct 1, 1937 | 14.36 | 
| Sep 1, 1937 | 16.85 | 
| Aug 1, 1937 | 19.81 | 
| Jul 1, 1937 | 19.65 | 
| Jun 1, 1937 | 18.71 | 
| May 1, 1937 | 19.47 | 
| Apr 1, 1937 | 20.56 | 
| Mar 1, 1937 | 22.04 | 
| Feb 1, 1937 | 22.24 | 
| Jan 1, 1937 | 21.62 | 
| Dec 1, 1936 | 21.13 | 
| Nov 1, 1936 | 21.50 | 
| Oct 1, 1936 | 20.91 | 
| Sep 1, 1936 | 19.86 | 
| Aug 1, 1936 | 19.62 | 
| Jul 1, 1936 | 19.36 | 
| Jun 1, 1936 | 18.39 | 
| May 1, 1936 | 17.75 | 
| Apr 1, 1936 | 18.72 | 
| Mar 1, 1936 | 18.66 | 
| Feb 1, 1936 | 18.10 | 
| Jan 1, 1936 | 17.09 | 
| Dec 1, 1935 | 16.16 | 
| Nov 1, 1935 | 16.13 | 
| Oct 1, 1935 | 14.83 | 
| Sep 1, 1935 | 14.42 | 
| Aug 1, 1935 | 14.11 | 
| Jul 1, 1935 | 13.20 | 
| Jun 1, 1935 | 12.54 | 
| May 1, 1935 | 11.99 | 
| Apr 1, 1935 | 11.10 | 
| Mar 1, 1935 | 10.40 | 
| Feb 1, 1935 | 11.09 | 
| Jan 1, 1935 | 11.50 | 
| Dec 1, 1934 | 11.64 | 
| Nov 1, 1934 | 11.45 | 
| Oct 1, 1934 | 11.11 | 
| Sep 1, 1934 | 10.91 | 
| Aug 1, 1934 | 11.32 | 
| Jul 1, 1934 | 11.74 | 
| Jun 1, 1934 | 12.29 | 
| May 1, 1934 | 12.18 | 
| Apr 1, 1934 | 13.52 | 
| Mar 1, 1934 | 13.25 | 
| Feb 1, 1934 | 13.93 | 
| Jan 1, 1934 | 13.03 | 
| Dec 1, 1933 | 12.28 | 
| Nov 1, 1933 | 12.01 | 
| Oct 1, 1933 | 11.70 | 
| Sep 1, 1933 | 12.92 | 
| Aug 1, 1933 | 13.00 | 
| Jul 1, 1933 | 13.75 | 
| Jun 1, 1933 | 13.10 | 
| May 1, 1933 | 11.25 | 
| Apr 1, 1933 | 8.72 | 
| Mar 1, 1933 | 7.87 | 
| Feb 1, 1933 | 7.83 | 
| Jan 1, 1933 | 8.73 | 
| Dec 1, 1932 | 8.26 | 
| Nov 1, 1932 | 8.46 | 
| Oct 1, 1932 | 8.48 | 
| Sep 1, 1932 | 9.76 | 
| Aug 1, 1932 | 8.83 | 
| Jul 1, 1932 | 5.84 | 
| Jun 1, 1932 | 5.57 | 
| May 1, 1932 | 6.39 | 
| Apr 1, 1932 | 7.19 | 
| Mar 1, 1932 | 9.41 | 
| Feb 1, 1932 | 9.34 | 
| Jan 1, 1932 | 9.31 | 
| Dec 1, 1931 | 9.31 | 
| Nov 1, 1931 | 11.42 | 
| Oct 1, 1931 | 11.15 | 
| Sep 1, 1931 | 12.82 | 
| Aug 1, 1931 | 15.01 | 
| Jul 1, 1931 | 15.52 | 
| Jun 1, 1931 | 15.06 | 
| May 1, 1931 | 15.40 | 
| Apr 1, 1931 | 16.87 | 
| Mar 1, 1931 | 18.58 | 
| Feb 1, 1931 | 18.16 | 
| Jan 1, 1931 | 16.71 | 
| Dec 1, 1930 | 16.06 | 
| Nov 1, 1930 | 16.94 | 
| Oct 1, 1930 | 18.21 | 
| Sep 1, 1930 | 21.07 | 
| Aug 1, 1930 | 21.30 | 
| Jul 1, 1930 | 21.55 | 
| Jun 1, 1930 | 21.87 | 
| May 1, 1930 | 24.31 | 
| Apr 1, 1930 | 25.84 | 
| Mar 1, 1930 | 24.59 | 
| Feb 1, 1930 | 23.70 | 
| Jan 1, 1930 | 22.31 | 
| Dec 1, 1929 | 22.01 | 
| Nov 1, 1929 | 21.17 | 
| Oct 1, 1929 | 28.96 | 
| Sep 1, 1929 | 32.56 | 
| Aug 1, 1929 | 31.48 | 
| Jul 1, 1929 | 29.93 | 
| Jun 1, 1929 | 27.94 | 
| May 1, 1929 | 27.70 | 
| Apr 1, 1929 | 27.57 | 
| Mar 1, 1929 | 27.68 | 
| Feb 1, 1929 | 27.13 | 
| Jan 1, 1929 | 27.08 | 
| Dec 1, 1928 | 25.30 | 
| Nov 1, 1928 | 25.12 | 
| Oct 1, 1928 | 23.58 | 
| Sep 1, 1928 | 23.00 | 
| Aug 1, 1928 | 21.76 | 
| Jul 1, 1928 | 21.08 | 
| Jun 1, 1928 | 20.91 | 
| May 1, 1928 | 21.83 | 
| Apr 1, 1928 | 21.26 | 
| Mar 1, 1928 | 19.94 | 
| Feb 1, 1928 | 18.87 | 
| Jan 1, 1928 | 18.81 | 
| Dec 1, 1927 | 18.65 | 
| Nov 1, 1927 | 18.13 | 
| Oct 1, 1927 | 17.54 | 
| Sep 1, 1927 | 17.82 | 
| Aug 1, 1927 | 16.86 | 
| Jul 1, 1927 | 15.82 | 
| Jun 1, 1927 | 15.12 | 
| May 1, 1927 | 15.00 | 
| Apr 1, 1927 | 14.49 | 
| Mar 1, 1927 | 14.03 | 
| Feb 1, 1927 | 13.63 | 
| Jan 1, 1927 | 13.19 | 
| Dec 1, 1926 | 13.01 | 
| Nov 1, 1926 | 12.62 | 
| Oct 1, 1926 | 12.43 | 
| Sep 1, 1926 | 12.69 | 
| Aug 1, 1926 | 12.49 | 
| Jul 1, 1926 | 11.87 | 
| Jun 1, 1926 | 11.20 | 
| May 1, 1926 | 10.58 | 
| Apr 1, 1926 | 10.40 | 
| Mar 1, 1926 | 10.71 | 
| Feb 1, 1926 | 11.39 | 
| Jan 1, 1926 | 11.34 | 
| Dec 1, 1925 | 11.15 | 
| Nov 1, 1925 | 10.89 | 
| Oct 1, 1925 | 10.72 | 
| Sep 1, 1925 | 10.36 | 
| Aug 1, 1925 | 10.11 | 
| Jul 1, 1925 | 9.96 | 
| Jun 1, 1925 | 9.80 | 
| May 1, 1925 | 9.73 | 
| Apr 1, 1925 | 9.48 | 
| Mar 1, 1925 | 9.52 | 
| Feb 1, 1925 | 9.83 | 
| Jan 1, 1925 | 9.69 | 
| Dec 1, 1924 | 9.31 | 
| Nov 1, 1924 | 8.89 | 
| Oct 1, 1924 | 8.42 | 
| Sep 1, 1924 | 8.58 | 
| Aug 1, 1924 | 8.72 | 
| Jul 1, 1924 | 8.38 | 
| Jun 1, 1924 | 8.05 | 
| May 1, 1924 | 7.90 | 
| Apr 1, 1924 | 7.92 | 
| Mar 1, 1924 | 8.06 | 
| Feb 1, 1924 | 8.16 | 
| Jan 1, 1924 | 8.07 | 
| Dec 1, 1923 | 7.81 | 
| Nov 1, 1923 | 7.55 | 
| Oct 1, 1923 | 7.32 | 
| Sep 1, 1923 | 7.46 | 
| Aug 1, 1923 | 7.44 | 
| Jul 1, 1923 | 7.35 | 
| Jun 1, 1923 | 7.67 | 
| May 1, 1923 | 8.00 | 
| Apr 1, 1923 | 8.37 | 
| Mar 1, 1923 | 8.70 | 
| Feb 1, 1923 | 8.53 | 
| Jan 1, 1923 | 8.15 | 
| Dec 1, 1922 | 7.96 | 
| Nov 1, 1922 | 8.00 | 
| Oct 1, 1922 | 8.43 | 
| Sep 1, 1922 | 8.27 | 
| Aug 1, 1922 | 8.02 | 
| Jul 1, 1922 | 7.60 | 
| Jun 1, 1922 | 7.56 | 
| May 1, 1922 | 7.59 | 
| Apr 1, 1922 | 7.27 | 
| Mar 1, 1922 | 6.82 | 
| Feb 1, 1922 | 6.46 | 
| Jan 1, 1922 | 6.29 | 
| Dec 1, 1921 | 6.11 | 
| Nov 1, 1921 | 5.84 | 
| Oct 1, 1921 | 5.48 | 
| Sep 1, 1921 | 5.38 | 
| Aug 1, 1921 | 5.16 | 
| Jul 1, 1921 | 5.20 | 
| Jun 1, 1921 | 5.22 | 
| May 1, 1921 | 5.61 | 
| Apr 1, 1921 | 5.30 | 
| Mar 1, 1921 | 5.19 | 
| Feb 1, 1921 | 5.27 | 
| Jan 1, 1921 | 5.12 | 
| Dec 1, 1920 | 4.78 | 
| Nov 1, 1920 | 5.13 | 
| Oct 1, 1920 | 5.35 | 
| Sep 1, 1920 | 5.30 | 
| Aug 1, 1920 | 5.02 | 
| Jul 1, 1920 | 5.08 | 
| Jun 1, 1920 | 5.04 | 
| May 1, 1920 | 5.19 | 
| Apr 1, 1920 | 5.60 | 
| Mar 1, 1920 | 5.80 | 
| Feb 1, 1920 | 5.46 | 
| Jan 1, 1920 | 5.99 | 
| Dec 1, 1919 | 6.16 | 
| Nov 1, 1919 | 6.47 | 
| Oct 1, 1919 | 6.79 | 
| Sep 1, 1919 | 6.56 | 
| Aug 1, 1919 | 6.48 | 
| Jul 1, 1919 | 7.05 | 
| Jun 1, 1919 | 7.02 | 
| May 1, 1919 | 6.83 | 
| Apr 1, 1919 | 6.46 | 
| Mar 1, 1919 | 6.36 | 
| Feb 1, 1919 | 6.24 | 
| Jan 1, 1919 | 6.10 | 
| Dec 1, 1918 | 6.13 | 
| Nov 1, 1918 | 6.33 | 
| Oct 1, 1918 | 6.29 | 
| Sep 1, 1918 | 6.15 | 
| Aug 1, 1918 | 6.30 | 
| Jul 1, 1918 | 6.37 | 
| Jun 1, 1918 | 6.50 | 
| May 1, 1918 | 6.58 | 
| Apr 1, 1918 | 6.52 | 
| Mar 1, 1918 | 6.69 | 
| Feb 1, 1918 | 6.78 | 
| Jan 1, 1918 | 6.64 | 
| Dec 1, 1917 | 6.41 | 
| Nov 1, 1917 | 6.75 | 
| Oct 1, 1917 | 7.39 | 
| Sep 1, 1917 | 7.95 | 
| Aug 1, 1917 | 8.57 | 
| Jul 1, 1917 | 9.00 | 
| Jun 1, 1917 | 9.15 | 
| May 1, 1917 | 9.14 | 
| Apr 1, 1917 | 9.64 | 
| Mar 1, 1917 | 10.33 | 
| Feb 1, 1917 | 10.06 | 
| Jan 1, 1917 | 10.99 | 
| Dec 1, 1916 | 11.41 | 
| Nov 1, 1916 | 12.05 | 
| Oct 1, 1916 | 12.05 | 
| Sep 1, 1916 | 11.94 | 
| Aug 1, 1916 | 11.73 | 
| Jul 1, 1916 | 11.79 | 
| Jun 1, 1916 | 12.00 | 
| May 1, 1916 | 12.03 | 
| Apr 1, 1916 | 11.91 | 
| Mar 1, 1916 | 12.18 | 
| Feb 1, 1916 | 12.35 | 
| Jan 1, 1916 | 12.54 | 
| Dec 1, 1915 | 12.88 | 
| Nov 1, 1915 | 12.86 | 
| Oct 1, 1915 | 12.55 | 
| Sep 1, 1915 | 12.01 | 
| Aug 1, 1915 | 11.58 | 
| Jul 1, 1915 | 11.11 | 
| Jun 1, 1915 | 11.15 | 
| May 1, 1915 | 11.03 | 
| Apr 1, 1915 | 11.40 | 
| Mar 1, 1915 | 10.71 | 
| Feb 1, 1915 | 10.33 | 
| Jan 1, 1915 | 10.36 | 
| Dec 1, 1914 | 10.17 | 
| Nov 1, 1914 | 10.52 | 
| Oct 1, 1914 | 10.61 | 
| Sep 1, 1914 | 10.50 | 
| Aug 1, 1914 | 10.49 | 
| Jul 1, 1914 | 10.69 | 
| Jun 1, 1914 | 11.43 | 
| May 1, 1914 | 11.48 | 
| Apr 1, 1914 | 11.52 | 
| Mar 1, 1914 | 11.69 | 
| Feb 1, 1914 | 11.91 | 
| Jan 1, 1914 | 11.64 | 
| Dec 1, 1913 | 11.17 | 
| Nov 1, 1913 | 11.07 | 
| Oct 1, 1913 | 11.47 | 
| Sep 1, 1913 | 11.84 | 
| Aug 1, 1913 | 11.85 | 
| Jul 1, 1913 | 11.53 | 
| Jun 1, 1913 | 11.49 | 
| May 1, 1913 | 12.22 | 
| Apr 1, 1913 | 12.43 | 
| Mar 1, 1913 | 12.44 | 
| Feb 1, 1913 | 12.68 | 
| Jan 1, 1913 | 13.15 | 
| Dec 1, 1912 | 13.40 | 
| Nov 1, 1912 | 13.75 | 
| Oct 1, 1912 | 13.90 | 
| Sep 1, 1912 | 13.93 | 
| Aug 1, 1912 | 13.99 | 
| Jul 1, 1912 | 13.80 | 
| Jun 1, 1912 | 13.78 | 
| May 1, 1912 | 13.65 | 
| Apr 1, 1912 | 13.66 | 
| Mar 1, 1912 | 13.64 | 
| Feb 1, 1912 | 13.53 | 
| Jan 1, 1912 | 13.80 | 
| Dec 1, 1911 | 13.93 | 
| Nov 1, 1911 | 13.73 | 
| Oct 1, 1911 | 13.07 | 
| Sep 1, 1911 | 13.00 | 
| Aug 1, 1911 | 13.91 | 
| Jul 1, 1911 | 15.08 | 
| Jun 1, 1911 | 15.33 | 
| May 1, 1911 | 15.05 | 
| Apr 1, 1911 | 14.76 | 
| Mar 1, 1911 | 14.37 | 
| Feb 1, 1911 | 14.73 | 
| Jan 1, 1911 | 14.05 | 
| Dec 1, 1910 | 13.74 | 
| Nov 1, 1910 | 14.16 | 
| Oct 1, 1910 | 13.92 | 
| Sep 1, 1910 | 12.94 | 
| Aug 1, 1910 | 12.75 | 
| Jul 1, 1910 | 12.34 | 
| Jun 1, 1910 | 13.01 | 
| May 1, 1910 | 13.57 | 
| Apr 1, 1910 | 13.56 | 
| Mar 1, 1910 | 14.04 | 
| Feb 1, 1910 | 14.00 | 
| Jan 1, 1910 | 14.54 | 
| Dec 1, 1909 | 14.75 | 
| Nov 1, 1909 | 14.74 | 
| Oct 1, 1909 | 14.99 | 
| Sep 1, 1909 | 15.25 | 
| Aug 1, 1909 | 15.43 | 
| Jul 1, 1909 | 15.23 | 
| Jun 1, 1909 | 15.04 | 
| May 1, 1909 | 14.96 | 
| Apr 1, 1909 | 14.64 | 
| Mar 1, 1909 | 14.33 | 
| Feb 1, 1909 | 14.17 | 
| Jan 1, 1909 | 14.77 | 
| Dec 1, 1908 | 14.58 | 
| Nov 1, 1908 | 14.44 | 
| Oct 1, 1908 | 13.69 | 
| Sep 1, 1908 | 13.71 | 
| Aug 1, 1908 | 13.89 | 
| Jul 1, 1908 | 13.35 | 
| Jun 1, 1908 | 13.05 | 
| May 1, 1908 | 13.08 | 
| Apr 1, 1908 | 12.45 | 
| Mar 1, 1908 | 11.99 | 
| Feb 1, 1908 | 11.56 | 
| Jan 1, 1908 | 11.90 | 
| Dec 1, 1907 | 11.34 | 
| Nov 1, 1907 | 10.60 | 
| Oct 1, 1907 | 10.84 | 
| Sep 1, 1907 | 12.33 | 
| Aug 1, 1907 | 12.51 | 
| Jul 1, 1907 | 13.58 | 
| Jun 1, 1907 | 13.14 | 
| May 1, 1907 | 13.80 | 
| Apr 1, 1907 | 14.68 | 
| Mar 1, 1907 | 14.69 | 
| Feb 1, 1907 | 16.22 | 
| Jan 1, 1907 | 17.22 | 
| Dec 1, 1906 | 17.67 | 
| Nov 1, 1906 | 18.14 | 
| Oct 1, 1906 | 18.10 | 
| Sep 1, 1906 | 19.21 | 
| Aug 1, 1906 | 18.96 | 
| Jul 1, 1906 | 18.19 | 
| Jun 1, 1906 | 18.18 | 
| May 1, 1906 | 18.06 | 
| Apr 1, 1906 | 18.87 | 
| Mar 1, 1906 | 19.26 | 
| Feb 1, 1906 | 19.86 | 
| Jan 1, 1906 | 20.13 | 
| Dec 1, 1905 | 19.57 | 
| Nov 1, 1905 | 19.45 | 
| Oct 1, 1905 | 19.89 | 
| Sep 1, 1905 | 19.74 | 
| Aug 1, 1905 | 19.58 | 
| Jul 1, 1905 | 19.20 | 
| Jun 1, 1905 | 18.73 | 
| May 1, 1905 | 18.63 | 
| Apr 1, 1905 | 19.49 | 
| Mar 1, 1905 | 19.84 | 
| Feb 1, 1905 | 19.17 | 
| Jan 1, 1905 | 18.46 | 
| Dec 1, 1904 | 18.16 | 
| Nov 1, 1904 | 18.07 | 
| Oct 1, 1904 | 17.63 | 
| Sep 1, 1904 | 16.74 | 
| Aug 1, 1904 | 16.31 | 
| Jul 1, 1904 | 16.03 | 
| Jun 1, 1904 | 15.47 | 
| May 1, 1904 | 15.52 | 
| Apr 1, 1904 | 15.56 | 
| Mar 1, 1904 | 15.09 | 
| Feb 1, 1904 | 15.02 | 
| Jan 1, 1904 | 15.86 | 
| Dec 1, 1903 | 16.04 | 
| Nov 1, 1903 | 15.40 | 
| Oct 1, 1903 | 15.26 | 
| Sep 1, 1903 | 15.65 | 
| Aug 1, 1903 | 16.31 | 
| Jul 1, 1903 | 16.93 | 
| Jun 1, 1903 | 17.83 | 
| May 1, 1903 | 18.96 | 
| Apr 1, 1903 | 18.99 | 
| Mar 1, 1903 | 19.89 | 
| Feb 1, 1903 | 20.11 | 
| Jan 1, 1903 | 20.32 | 
| Dec 1, 1902 | 19.64 | 
| Nov 1, 1902 | 20.41 | 
| Oct 1, 1902 | 20.62 | 
| Sep 1, 1902 | 22.87 | 
| Aug 1, 1902 | 23.17 | 
| Jul 1, 1902 | 22.40 | 
| Jun 1, 1902 | 21.97 | 
| May 1, 1902 | 22.42 | 
| Apr 1, 1902 | 22.83 | 
| Mar 1, 1902 | 22.41 | 
| Feb 1, 1902 | 22.46 | 
| Jan 1, 1902 | 22.34 | 
| Dec 1, 1901 | 21.69 | 
| Nov 1, 1901 | 22.37 | 
| Oct 1, 1901 | 22.26 | 
| Sep 1, 1901 | 22.60 | 
| Aug 1, 1901 | 23.07 | 
| Jul 1, 1901 | 23.15 | 
| Jun 1, 1901 | 25.23 | 
| May 1, 1901 | 23.06 | 
| Apr 1, 1901 | 24.40 | 
| Mar 1, 1901 | 22.36 | 
| Feb 1, 1901 | 21.69 | 
| Jan 1, 1901 | 20.97 | 
| Dec 1, 1900 | 20.75 | 
| Nov 1, 1900 | 19.42 | 
| Oct 1, 1900 | 18.10 | 
| Sep 1, 1900 | 17.35 | 
| Aug 1, 1900 | 18.07 | 
| Jul 1, 1900 | 17.70 | 
| Jun 1, 1900 | 17.99 | 
| May 1, 1900 | 18.41 | 
| Apr 1, 1900 | 18.95 | 
| Mar 1, 1900 | 18.78 | 
| Feb 1, 1900 | 18.71 | 
| Jan 1, 1900 | 18.67 | 
| Dec 1, 1899 | 18.51 | 
| Nov 1, 1899 | 20.21 | 
| Oct 1, 1899 | 20.15 | 
| Sep 1, 1899 | 20.60 | 
| Aug 1, 1899 | 21.72 | 
| Jul 1, 1899 | 21.57 | 
| Jun 1, 1899 | 21.20 | 
| May 1, 1899 | 22.10 | 
| Apr 1, 1899 | 23.16 | 
| Mar 1, 1899 | 23.27 | 
| Feb 1, 1899 | 23.04 | 
| Jan 1, 1899 | 22.92 | 
| Dec 1, 1898 | 21.39 | 
| Nov 1, 1898 | 20.53 | 
| Oct 1, 1898 | 19.95 | 
| Sep 1, 1898 | 20.45 | 
| Aug 1, 1898 | 20.55 | 
| Jul 1, 1898 | 19.86 | 
| Jun 1, 1898 | 19.53 | 
| May 1, 1898 | 17.60 | 
| Apr 1, 1898 | 17.70 | 
| Mar 1, 1898 | 18.03 | 
| Feb 1, 1898 | 18.91 | 
| Jan 1, 1898 | 19.25 | 
| Dec 1, 1897 | 18.75 | 
| Nov 1, 1897 | 18.36 | 
| Oct 1, 1897 | 19.03 | 
| Sep 1, 1897 | 19.36 | 
| Aug 1, 1897 | 18.99 | 
| Jul 1, 1897 | 18.65 | 
| Jun 1, 1897 | 17.85 | 
| May 1, 1897 | 17.05 | 
| Apr 1, 1897 | 16.71 | 
| Mar 1, 1897 | 16.96 | 
| Feb 1, 1897 | 16.90 | 
| Jan 1, 1897 | 17.03 | 
| Dec 1, 1896 | 16.50 | 
| Nov 1, 1896 | 17.09 | 
| Oct 1, 1896 | 16.44 | 
| Sep 1, 1896 | 16.55 | 
| Aug 1, 1896 | 15.70 | 
| Jul 1, 1896 | 16.64 | 
| Jun 1, 1896 | 17.78 | 
| May 1, 1896 | 17.84 | 
| Apr 1, 1896 | 17.65 | 
| Mar 1, 1896 | 17.22 | 
| Feb 1, 1896 | 17.50 | 
| Jan 1, 1896 | 16.58 | 
| Dec 1, 1895 | 16.54 | 
| Nov 1, 1895 | 17.35 | 
| Oct 1, 1895 | 17.95 | 
| Sep 1, 1895 | 18.20 | 
| Aug 1, 1895 | 18.08 | 
| Jul 1, 1895 | 17.54 | 
| Jun 1, 1895 | 17.21 | 
| May 1, 1895 | 17.07 | 
| Apr 1, 1895 | 16.39 | 
| Mar 1, 1895 | 16.35 | 
| Feb 1, 1895 | 16.32 | 
| Jan 1, 1895 | 16.51 | 
| Dec 1, 1894 | 16.66 | 
| Nov 1, 1894 | 16.55 | 
| Oct 1, 1894 | 16.51 | 
| Sep 1, 1894 | 16.53 | 
| Aug 1, 1894 | 16.45 | 
| Jul 1, 1894 | 16.28 | 
| Jun 1, 1894 | 16.60 | 
| May 1, 1894 | 16.80 | 
| Apr 1, 1894 | 17.42 | 
| Mar 1, 1894 | 17.18 | 
| Feb 1, 1894 | 16.19 | 
| Jan 1, 1894 | 15.74 | 
| Dec 1, 1893 | 15.62 | 
| Nov 1, 1893 | 15.93 | 
| Oct 1, 1893 | 15.27 | 
| Sep 1, 1893 | 15.02 | 
| Aug 1, 1893 | 14.58 | 
| Jul 1, 1893 | 14.35 | 
| Jun 1, 1893 | 15.42 | 
| May 1, 1893 | 15.79 | 
| Apr 1, 1893 | 17.10 | 
| Mar 1, 1893 | 16.90 | 
| Feb 1, 1893 | 17.13 | 
| Jan 1, 1893 | 17.65 | 
| Dec 1, 1892 | 18.02 | 
| Nov 1, 1892 | 18.46 | 
| Oct 1, 1892 | 19.03 | 
| Sep 1, 1892 | 18.69 | 
| Aug 1, 1892 | 19.20 | 
| Jul 1, 1892 | 19.22 | 
| Jun 1, 1892 | 19.77 | 
| May 1, 1892 | 19.92 | 
| Apr 1, 1892 | 19.95 | 
| Mar 1, 1892 | 19.73 | 
| Feb 1, 1892 | 19.03 | 
| Jan 1, 1892 | 19.01 | 
| Dec 1, 1891 | 18.20 | 
| Nov 1, 1891 | 17.66 | 
| Oct 1, 1891 | 17.72 | 
| Sep 1, 1891 | 17.72 | 
| Aug 1, 1891 | 16.16 | 
| Jul 1, 1891 | 15.61 | 
| Jun 1, 1891 | 15.66 | 
| May 1, 1891 | 15.57 | 
| Apr 1, 1891 | 15.40 | 
| Mar 1, 1891 | 15.06 | 
| Feb 1, 1891 | 15.47 | 
| Jan 1, 1891 | 15.43 | 
| Dec 1, 1890 | 14.44 | 
| Nov 1, 1890 | 14.74 | 
| Oct 1, 1890 | 15.48 | 
| Sep 1, 1890 | 16.16 | 
| Aug 1, 1890 | 16.60 | 
| Jul 1, 1890 | 17.58 | 
| Jun 1, 1890 | 17.68 | 
| May 1, 1890 | 17.78 | 
| Apr 1, 1890 | 17.26 | 
| Mar 1, 1890 | 16.90 | 
| Feb 1, 1890 | 17.03 | 
| Jan 1, 1890 | 17.22 | 
| Dec 1, 1889 | 16.61 | 
| Nov 1, 1889 | 16.90 | 
| Oct 1, 1889 | 17.05 | 
| Sep 1, 1889 | 17.34 | 
| Aug 1, 1889 | 17.14 | 
| Jul 1, 1889 | 16.89 | 
| Jun 1, 1889 | 17.22 | 
| May 1, 1889 | 16.92 | 
| Apr 1, 1889 | 16.05 | 
| Mar 1, 1889 | 16.07 | 
| Feb 1, 1889 | 16.19 | 
| Jan 1, 1889 | 15.81 | 
| Dec 1, 1888 | 14.94 | 
| Nov 1, 1888 | 15.22 | 
| Oct 1, 1888 | 15.72 | 
| Sep 1, 1888 | 15.98 | 
| Aug 1, 1888 | 15.60 | 
| Jul 1, 1888 | 15.27 | 
| Jun 1, 1888 | 15.08 | 
| May 1, 1888 | 15.38 | 
| Apr 1, 1888 | 15.02 | 
| Mar 1, 1888 | 14.80 | 
| Feb 1, 1888 | 15.41 | 
| Jan 1, 1888 | 15.36 | 
| Dec 1, 1887 | 15.45 | 
| Nov 1, 1887 | 15.95 | 
| Oct 1, 1887 | 15.88 | 
| Sep 1, 1887 | 16.67 | 
| Aug 1, 1887 | 16.74 | 
| Jul 1, 1887 | 17.42 | 
| Jun 1, 1887 | 17.71 | 
| May 1, 1887 | 18.07 | 
| Apr 1, 1887 | 17.82 | 
| Mar 1, 1887 | 17.47 | 
| Feb 1, 1887 | 17.12 | 
| Jan 1, 1887 | 17.52 | 
| Dec 1, 1886 | 18.20 | 
| Nov 1, 1886 | 18.96 | 
| Oct 1, 1886 | 18.55 | 
| Sep 1, 1886 | 18.14 | 
| Aug 1, 1886 | 17.72 | 
| Jul 1, 1886 | 17.85 | 
| Jun 1, 1886 | 17.82 | 
| May 1, 1886 | 16.87 | 
| Apr 1, 1886 | 16.81 | 
| Mar 1, 1886 | 16.84 | 
| Feb 1, 1886 | 17.01 | 
| Jan 1, 1886 | 16.70 | 
| Dec 1, 1885 | 16.31 | 
| Nov 1, 1885 | 16.83 | 
| Oct 1, 1885 | 15.98 | 
| Sep 1, 1885 | 15.11 | 
| Aug 1, 1885 | 15.13 | 
| Jul 1, 1885 | 14.33 | 
| Jun 1, 1885 | 13.97 | 
| May 1, 1885 | 13.71 | 
| Apr 1, 1885 | 13.54 | 
| Mar 1, 1885 | 13.74 | 
| Feb 1, 1885 | 13.39 | 
| Jan 1, 1885 | 13.13 | 
| Dec 1, 1884 | 13.43 | 
| Nov 1, 1884 | 13.31 | 
| Oct 1, 1884 | 13.28 | 
| Sep 1, 1884 | 13.57 | 
| Aug 1, 1884 | 13.86 | 
| Jul 1, 1884 | 13.05 | 
| Jun 1, 1884 | 12.90 | 
| May 1, 1884 | 13.46 | 
| Apr 1, 1884 | 14.35 | 
| Mar 1, 1884 | 14.73 | 
| Feb 1, 1884 | 14.80 | 
| Jan 1, 1884 | 14.43 | 
| Dec 1, 1883 | 14.89 | 
| Nov 1, 1883 | 15.41 | 
| Oct 1, 1883 | 15.05 | 
| Sep 1, 1883 | 15.49 | 
| Aug 1, 1883 | 15.20 | 
| Jul 1, 1883 | 15.96 | 
| Jun 1, 1883 | 15.91 | 
| May 1, 1883 | 15.33 | 
| Apr 1, 1883 | 15.47 | 
| Mar 1, 1883 | 15.05 | 
| Feb 1, 1883 | 14.75 | 
| Jan 1, 1883 | 15.27 | 
| Dec 1, 1882 | 15.38 | 
| Nov 1, 1882 | 15.19 | 
| Oct 1, 1882 | 15.76 | 
| Sep 1, 1882 | 16.07 | 
| Aug 1, 1882 | 15.53 | 
| Jul 1, 1882 | 15.23 | 
| Jun 1, 1882 | 14.33 | 
| May 1, 1882 | 14.56 | 
| Apr 1, 1882 | 14.92 | 
| Mar 1, 1882 | 15.08 | 
| Feb 1, 1882 | 15.15 | 
| Jan 1, 1882 | 15.68 | 
| Dec 1, 1881 | 15.96 | 
| Nov 1, 1881 | 16.48 | 
| Oct 1, 1881 | 16.25 | 
| Sep 1, 1881 | 16.72 | 
| Aug 1, 1881 | 17.28 | 
| Jul 1, 1881 | 18.11 | 
| Jun 1, 1881 | 19.04 | 
| May 1, 1881 | 18.88 | 
| Apr 1, 1881 | 17.95 | 
| Mar 1, 1881 | 18.28 | 
| Feb 1, 1881 | 18.15 | 
| Jan 1, 1881 | 18.47 | 
| Dec 1, 1880 | 17.33 | 
| Nov 1, 1880 | 16.87 | 
| Oct 1, 1880 | 16.26 | 
| Sep 1, 1880 | 15.86 | 
| Aug 1, 1880 | 16.10 | 
| Jul 1, 1880 | 15.59 | 
| Jun 1, 1880 | 14.95 | 
| May 1, 1880 | 14.63 | 
| Apr 1, 1880 | 15.46 | 
| Mar 1, 1880 | 15.23 | 
| Feb 1, 1880 | 15.12 | 
| Jan 1, 1880 | 14.87 | 
| Dec 1, 1879 | 14.77 | 
| Nov 1, 1879 | 15.26 | 
| Oct 1, 1879 | 15.29 | 
| Sep 1, 1879 | 14.59 | 
| Aug 1, 1879 | 14.61 | 
| Jul 1, 1879 | 14.54 | 
| Jun 1, 1879 | 14.45 | 
| May 1, 1879 | 14.25 | 
| Apr 1, 1879 | 13.66 | 
| Mar 1, 1879 | 13.09 | 
| Feb 1, 1879 | 13.18 | 
| Jan 1, 1879 | 12.87 | 
| Dec 1, 1878 | 12.58 | 
| Nov 1, 1878 | 12.37 | 
| Oct 1, 1878 | 12.28 | 
| Sep 1, 1878 | 12.30 | 
| Aug 1, 1878 | 12.06 | 
| Jul 1, 1878 | 12.31 | 
| Jun 1, 1878 | 12.21 | 
| May 1, 1878 | 11.71 | 
| Apr 1, 1878 | 11.29 | 
| Mar 1, 1878 | 10.88 | 
| Feb 1, 1878 | 10.45 | 
| Jan 1, 1878 | 10.57 | 
| Dec 1, 1877 | 10.25 | 
| Nov 1, 1877 | 10.27 | 
| Oct 1, 1877 | 10.22 | 
| Sep 1, 1877 | 9.99 | 
| Aug 1, 1877 | 9.29 | 
| Jul 1, 1877 | 8.35 | 
| Jun 1, 1877 | 8.05 | 
| May 1, 1877 | 8.18 | 
| Apr 1, 1877 | 8.31 | 
| Mar 1, 1877 | 9.20 | 
| Feb 1, 1877 | 9.23 | 
| Jan 1, 1877 | 9.52 | 
| Dec 1, 1876 | 9.74 | 
| Nov 1, 1876 | 9.94 | 
| Oct 1, 1876 | 10.20 | 
| Sep 1, 1876 | 10.42 | 
| Aug 1, 1876 | 11.18 | 
| Jul 1, 1876 | 11.75 | 
| Jun 1, 1876 | 11.88 | 
| May 1, 1876 | 11.63 | 
| Apr 1, 1876 | 11.63 | 
| Mar 1, 1876 | 11.95 | 
| Feb 1, 1876 | 11.96 | 
| Jan 1, 1876 | 11.79 | 
| Dec 1, 1875 | 11.45 | 
| Nov 1, 1875 | 11.34 | 
| Oct 1, 1875 | 11.06 | 
| Sep 1, 1875 | 11.24 | 
| Aug 1, 1875 | 11.24 | 
| Jul 1, 1875 | 11.29 | 
| Jun 1, 1875 | 11.28 | 
| May 1, 1875 | 11.33 | 
| Apr 1, 1875 | 11.51 | 
| Mar 1, 1875 | 11.48 | 
| Feb 1, 1875 | 11.35 | 
| Jan 1, 1875 | 11.41 | 
| Dec 1, 1874 | 11.45 | 
| Nov 1, 1874 | 11.56 | 
| Oct 1, 1874 | 11.40 | 
| Sep 1, 1874 | 11.28 | 
| Aug 1, 1874 | 11.14 | 
| Jul 1, 1874 | 11.07 | 
| Jun 1, 1874 | 11.19 | 
| May 1, 1874 | 11.02 | 
| Apr 1, 1874 | 11.26 | 
| Mar 1, 1874 | 11.43 | 
| Feb 1, 1874 | 11.63 | 
| Jan 1, 1874 | 11.33 | 
| Dec 1, 1873 | 10.96 | 
| Nov 1, 1873 | 10.31 | 
| Oct 1, 1873 | 10.40 | 
| Sep 1, 1873 | 11.16 | 
| Aug 1, 1873 | 12.12 | 
| Jul 1, 1873 | 12.16 | 
| Jun 1, 1873 | 12.22 | 
| May 1, 1873 | 12.05 | 
| Apr 1, 1873 | 11.78 | 
| Mar 1, 1873 | 11.95 | 
| Feb 1, 1873 | 12.05 | 
| Jan 1, 1873 | 12.25 | 
| Dec 1, 1872 | 12.17 | 
| Nov 1, 1872 | 11.71 | 
| Oct 1, 1872 | 12.13 | 
| Sep 1, 1872 | 11.83 | 
| Aug 1, 1872 | 12.13 | 
| Jul 1, 1872 | 12.38 | 
| Jun 1, 1872 | 12.27 | 
| May 1, 1872 | 12.28 | 
| Apr 1, 1872 | 12.25 | 
| Mar 1, 1872 | 12.18 | 
| Feb 1, 1872 | 11.96 | 
| Jan 1, 1872 | 11.90 | 
| Dec 1, 1871 | 11.59 | 
| Nov 1, 1871 | 11.60 | 
| Oct 1, 1871 | 11.47 | 
| Sep 1, 1871 | 12.31 | 
| Aug 1, 1871 | 12.55 | 
| Jul 1, 1871 | 12.27 | 
| Jun 1, 1871 | 12.59 | 
| May 1, 1871 | 12.59 | 
| Apr 1, 1871 | 12.05 | 
| Mar 1, 1871 | 11.19 | 
| Feb 1, 1871 | 10.92 | 
Shiller PE ratio for the S&P 500.
Price earnings ratio is based on average inflation-adjusted earnings from the previous 10 years, known as the Cyclically Adjusted PE Ratio (CAPE Ratio), Shiller PE Ratio, or PE 10 — FAQ.
Data courtesy of 
  Robert Shiller 
  from his book,  Irrational Exuberance.