| Date | Value | 
|---|---|
| Oct 30, 2025 | † 31.62 | 
| Oct 1, 2025 | † 30.97 | 
| Sep 1, 2025 | † 30.38 | 
| Aug 1, 2025 | † 29.58 | 
| Jul 1, 2025 | † 29.06 | 
| Jun 1, 2025 | † 27.83 | 
| May 1, 2025 | † 26.82 | 
| Apr 1, 2025 | † 24.78 | 
| Mar 1, 2025 | 26.23 | 
| Feb 1, 2025 | 28.15 | 
| Jan 1, 2025 | 28.16 | 
| Dec 1, 2024 | 28.60 | 
| Nov 1, 2024 | 28.66 | 
| Oct 1, 2024 | 28.45 | 
| Sep 1, 2024 | 28.09 | 
| Aug 1, 2024 | 27.67 | 
| Jul 1, 2024 | 28.08 | 
| Jun 1, 2024 | 27.64 | 
| May 1, 2024 | 26.93 | 
| Apr 1, 2024 | 26.41 | 
| Mar 1, 2024 | 27.02 | 
| Feb 1, 2024 | 26.14 | 
| Jan 1, 2024 | 25.01 | 
| Dec 1, 2023 | 24.35 | 
| Nov 1, 2023 | 23.51 | 
| Oct 1, 2023 | 22.78 | 
| Sep 1, 2023 | 23.93 | 
| Aug 1, 2023 | 24.16 | 
| Jul 1, 2023 | 24.76 | 
| Jun 1, 2023 | 24.01 | 
| May 1, 2023 | 23.15 | 
| Apr 1, 2023 | 23.27 | 
| Mar 1, 2023 | 22.66 | 
| Feb 1, 2023 | 23.40 | 
| Jan 1, 2023 | 22.82 | 
| Dec 1, 2022 | 22.65 | 
| Nov 1, 2022 | 22.07 | 
| Oct 1, 2022 | 20.44 | 
| Sep 1, 2022 | 20.58 | 
| Aug 1, 2022 | 22.03 | 
| Jul 1, 2022 | 20.53 | 
| Jun 1, 2022 | 20.28 | 
| May 1, 2022 | 20.81 | 
| Apr 1, 2022 | 22.40 | 
| Mar 1, 2022 | 22.19 | 
| Feb 1, 2022 | 22.42 | 
| Jan 1, 2022 | 23.11 | 
| Dec 1, 2021 | 23.63 | 
| Nov 1, 2021 | 24.52 | 
| Oct 1, 2021 | 24.39 | 
| Sep 1, 2021 | 25.35 | 
| Aug 1, 2021 | 26.23 | 
| Jul 1, 2021 | 26.56 | 
| Jun 1, 2021 | 26.70 | 
| May 1, 2021 | 28.05 | 
| Apr 1, 2021 | 29.92 | 
| Mar 1, 2021 | 30.50 | 
| Feb 1, 2021 | 33.24 | 
| Jan 1, 2021 | 35.96 | 
| Dec 1, 2020 | 39.26 | 
| Nov 1, 2020 | 37.16 | 
| Oct 1, 2020 | 35.30 | 
| Sep 1, 2020 | 34.27 | 
| Aug 1, 2020 | 34.41 | 
| Jul 1, 2020 | 32.44 | 
| Jun 1, 2020 | 31.29 | 
| May 1, 2020 | 27.82 | 
| Apr 1, 2020 | 24.97 | 
| Mar 1, 2020 | 22.80 | 
| Feb 1, 2020 | 26.42 | 
| Jan 1, 2020 | 24.88 | 
| Dec 1, 2019 | 22.78 | 
| Nov 1, 2019 | 22.62 | 
| Oct 1, 2019 | 22.04 | 
| Sep 1, 2019 | 22.44 | 
| Aug 1, 2019 | 21.67 | 
| Jul 1, 2019 | 22.28 | 
| Jun 1, 2019 | 21.37 | 
| May 1, 2019 | 21.15 | 
| Apr 1, 2019 | 21.56 | 
| Mar 1, 2019 | 20.86 | 
| Feb 1, 2019 | 20.60 | 
| Jan 1, 2019 | 19.60 | 
| Dec 1, 2018 | 19.39 | 
| Nov 1, 2018 | 20.67 | 
| Oct 1, 2018 | 21.25 | 
| Sep 1, 2018 | 22.25 | 
| Aug 1, 2018 | 22.37 | 
| Jul 1, 2018 | 22.33 | 
| Jun 1, 2018 | 22.49 | 
| May 1, 2018 | 22.49 | 
| Apr 1, 2018 | 22.53 | 
| Mar 1, 2018 | 23.41 | 
| Feb 1, 2018 | 23.82 | 
| Jan 1, 2018 | 24.97 | 
| Dec 1, 2017 | 24.25 | 
| Nov 1, 2017 | 23.81 | 
| Oct 1, 2017 | 23.67 | 
| Sep 1, 2017 | 23.28 | 
| Aug 1, 2017 | 23.16 | 
| Jul 1, 2017 | 23.36 | 
| Jun 1, 2017 | 23.40 | 
| May 1, 2017 | 23.31 | 
| Apr 1, 2017 | 23.24 | 
| Mar 1, 2017 | 23.60 | 
| Feb 1, 2017 | 23.68 | 
| Jan 1, 2017 | 23.59 | 
| Dec 1, 2016 | 23.76 | 
| Nov 1, 2016 | 23.35 | 
| Oct 1, 2016 | 23.57 | 
| Sep 1, 2016 | 24.22 | 
| Aug 1, 2016 | 24.57 | 
| Jul 1, 2016 | 24.52 | 
| Jun 1, 2016 | 23.97 | 
| May 1, 2016 | 23.81 | 
| Apr 1, 2016 | 23.97 | 
| Mar 1, 2016 | 23.39 | 
| Feb 1, 2016 | 22.02 | 
| Jan 1, 2016 | 22.18 | 
| Dec 1, 2015 | 23.74 | 
| Nov 1, 2015 | 23.67 | 
| Oct 1, 2015 | 22.68 | 
| Sep 1, 2015 | 21.45 | 
| Aug 1, 2015 | 22.15 | 
| Jul 1, 2015 | 22.40 | 
| Jun 1, 2015 | 22.12 | 
| May 1, 2015 | 21.92 | 
| Apr 1, 2015 | 21.42 | 
| Mar 1, 2015 | 20.96 | 
| Feb 1, 2015 | 20.77 | 
| Jan 1, 2015 | 20.02 | 
| Dec 1, 2014 | 20.08 | 
| Nov 1, 2014 | 19.75 | 
| Oct 1, 2014 | 18.50 | 
| Sep 1, 2014 | 18.81 | 
| Aug 1, 2014 | 18.68 | 
| Jul 1, 2014 | 18.96 | 
| Jun 1, 2014 | 18.88 | 
| May 1, 2014 | 18.46 | 
| Apr 1, 2014 | 18.35 | 
| Mar 1, 2014 | 18.48 | 
| Feb 1, 2014 | 18.06 | 
| Jan 1, 2014 | 18.15 | 
| Dec 1, 2013 | 18.04 | 
| Nov 1, 2013 | 18.15 | 
| Oct 1, 2013 | 17.86 | 
| Sep 1, 2013 | 17.88 | 
| Aug 1, 2013 | 17.91 | 
| Jul 1, 2013 | 18.12 | 
| Jun 1, 2013 | 17.80 | 
| May 1, 2013 | 18.25 | 
| Apr 1, 2013 | 17.69 | 
| Mar 1, 2013 | 17.68 | 
| Feb 1, 2013 | 17.32 | 
| Jan 1, 2013 | 17.03 | 
| Dec 1, 2012 | 16.44 | 
| Nov 1, 2012 | 16.12 | 
| Oct 1, 2012 | 16.62 | 
| Sep 1, 2012 | 16.69 | 
| Aug 1, 2012 | 16.14 | 
| Jul 1, 2012 | 15.55 | 
| Jun 1, 2012 | 15.05 | 
| May 1, 2012 | 15.22 | 
| Apr 1, 2012 | 15.70 | 
| Mar 1, 2012 | 15.69 | 
| Feb 1, 2012 | 15.37 | 
| Jan 1, 2012 | 14.87 | 
| Dec 1, 2011 | 14.30 | 
| Nov 1, 2011 | 14.10 | 
| Oct 1, 2011 | 13.88 | 
| Sep 1, 2011 | 13.50 | 
| Aug 1, 2011 | 13.79 | 
| Jul 1, 2011 | 15.61 | 
| Jun 1, 2011 | 15.35 | 
| May 1, 2011 | 16.12 | 
| Apr 1, 2011 | 16.21 | 
| Mar 1, 2011 | 16.04 | 
| Feb 1, 2011 | 16.52 | 
| Jan 1, 2011 | 16.30 | 
| Dec 1, 2010 | 16.05 | 
| Nov 1, 2010 | 15.88 | 
| Oct 1, 2010 | 15.90 | 
| Sep 1, 2010 | 15.61 | 
| Aug 1, 2010 | 15.47 | 
| Jul 1, 2010 | 15.72 | 
| Jun 1, 2010 | 16.15 | 
| May 1, 2010 | 17.30 | 
| Apr 1, 2010 | 19.01 | 
| Mar 1, 2010 | 18.91 | 
| Feb 1, 2010 | 18.91 | 
| Jan 1, 2010 | 20.70 | 
| Dec 1, 2009 | 21.78 | 
| Nov 1, 2009 | 28.51 | 
| Oct 1, 2009 | 42.12 | 
| Sep 1, 2009 | 83.30 | 
| Aug 1, 2009 | 92.95 | 
| Jul 1, 2009 | 101.87 | 
| Jun 1, 2009 | 123.32 | 
| May 1, 2009 | 123.73 | 
| Apr 1, 2009 | 119.85 | 
| Mar 1, 2009 | 110.37 | 
| Feb 1, 2009 | 84.46 | 
| Jan 1, 2009 | 70.91 | 
| Dec 1, 2008 | 58.98 | 
| Nov 1, 2008 | 34.99 | 
| Oct 1, 2008 | 27.22 | 
| Sep 1, 2008 | 26.48 | 
| Aug 1, 2008 | 26.83 | 
| Jul 1, 2008 | 25.37 | 
| Jun 1, 2008 | 26.11 | 
| May 1, 2008 | 25.81 | 
| Apr 1, 2008 | 23.88 | 
| Mar 1, 2008 | 21.81 | 
| Feb 1, 2008 | 21.74 | 
| Jan 1, 2008 | 21.46 | 
| Dec 1, 2007 | 22.35 | 
| Nov 1, 2007 | 20.81 | 
| Oct 1, 2007 | 20.68 | 
| Sep 1, 2007 | 19.05 | 
| Aug 1, 2007 | 18.02 | 
| Jul 1, 2007 | 18.36 | 
| Jun 1, 2007 | 17.83 | 
| May 1, 2007 | 17.92 | 
| Apr 1, 2007 | 17.48 | 
| Mar 1, 2007 | 16.92 | 
| Feb 1, 2007 | 17.49 | 
| Jan 1, 2007 | 17.36 | 
| Dec 1, 2006 | 17.38 | 
| Nov 1, 2006 | 17.24 | 
| Oct 1, 2006 | 17.14 | 
| Sep 1, 2006 | 16.77 | 
| Aug 1, 2006 | 16.67 | 
| Jul 1, 2006 | 16.61 | 
| Jun 1, 2006 | 16.82 | 
| May 1, 2006 | 17.46 | 
| Apr 1, 2006 | 17.77 | 
| Mar 1, 2006 | 17.80 | 
| Feb 1, 2006 | 17.80 | 
| Jan 1, 2006 | 18.07 | 
| Dec 1, 2005 | 18.07 | 
| Nov 1, 2005 | 18.01 | 
| Oct 1, 2005 | 17.64 | 
| Sep 1, 2005 | 18.44 | 
| Aug 1, 2005 | 18.72 | 
| Jul 1, 2005 | 19.00 | 
| Jun 1, 2005 | 19.00 | 
| May 1, 2005 | 18.93 | 
| Apr 1, 2005 | 19.02 | 
| Mar 1, 2005 | 19.84 | 
| Feb 1, 2005 | 20.11 | 
| Jan 1, 2005 | 19.99 | 
| Dec 1, 2004 | 20.48 | 
| Nov 1, 2004 | 20.05 | 
| Oct 1, 2004 | 19.25 | 
| Sep 1, 2004 | 19.35 | 
| Aug 1, 2004 | 19.03 | 
| Jul 1, 2004 | 19.51 | 
| Jun 1, 2004 | 20.17 | 
| May 1, 2004 | 20.14 | 
| Apr 1, 2004 | 21.23 | 
| Mar 1, 2004 | 21.61 | 
| Feb 1, 2004 | 22.46 | 
| Jan 1, 2004 | 22.73 | 
| Dec 1, 2003 | 22.17 | 
| Nov 1, 2003 | 23.15 | 
| Oct 1, 2003 | 24.75 | 
| Sep 1, 2003 | 26.42 | 
| Aug 1, 2003 | 26.57 | 
| Jul 1, 2003 | 27.65 | 
| Jun 1, 2003 | 28.60 | 
| May 1, 2003 | 28.24 | 
| Apr 1, 2003 | 28.05 | 
| Mar 1, 2003 | 27.92 | 
| Feb 1, 2003 | 28.46 | 
| Jan 1, 2003 | 31.43 | 
| Dec 1, 2002 | 32.59 | 
| Nov 1, 2002 | 32.03 | 
| Oct 1, 2002 | 29.24 | 
| Sep 1, 2002 | 28.89 | 
| Aug 1, 2002 | 31.53 | 
| Jul 1, 2002 | 32.46 | 
| Jun 1, 2002 | 37.92 | 
| May 1, 2002 | 41.41 | 
| Apr 1, 2002 | 43.81 | 
| Mar 1, 2002 | 46.71 | 
| Feb 1, 2002 | 44.57 | 
| Jan 1, 2002 | 46.17 | 
| Dec 1, 2001 | 46.37 | 
| Nov 1, 2001 | 43.62 | 
| Oct 1, 2001 | 39.72 | 
| Sep 1, 2001 | 36.90 | 
| Aug 1, 2001 | 37.85 | 
| Jul 1, 2001 | 35.46 | 
| Jun 1, 2001 | 33.67 | 
| May 1, 2001 | 32.02 | 
| Apr 1, 2001 | 27.96 | 
| Mar 1, 2001 | 26.10 | 
| Feb 1, 2001 | 27.81 | 
| Jan 1, 2001 | 27.55 | 
| Dec 1, 2000 | 26.62 | 
| Nov 1, 2000 | 26.90 | 
| Oct 1, 2000 | 26.50 | 
| Sep 1, 2000 | 27.34 | 
| Aug 1, 2000 | 27.97 | 
| Jul 1, 2000 | 28.05 | 
| Jun 1, 2000 | 28.16 | 
| May 1, 2000 | 27.49 | 
| Apr 1, 2000 | 28.50 | 
| Mar 1, 2000 | 28.31 | 
| Feb 1, 2000 | 27.76 | 
| Jan 1, 2000 | 29.04 | 
| Dec 1, 1999 | 29.66 | 
| Nov 1, 1999 | 29.74 | 
| Oct 1, 1999 | 28.66 | 
| Sep 1, 1999 | 29.99 | 
| Aug 1, 1999 | 30.89 | 
| Jul 1, 1999 | 32.88 | 
| Jun 1, 1999 | 32.24 | 
| May 1, 1999 | 33.19 | 
| Apr 1, 1999 | 34.00 | 
| Mar 1, 1999 | 33.39 | 
| Feb 1, 1999 | 32.67 | 
| Jan 1, 1999 | 32.92 | 
| Dec 1, 1998 | 31.56 | 
| Nov 1, 1998 | 30.25 | 
| Oct 1, 1998 | 27.20 | 
| Sep 1, 1998 | 26.80 | 
| Aug 1, 1998 | 28.00 | 
| Jul 1, 1998 | 29.90 | 
| Jun 1, 1998 | 28.44 | 
| May 1, 1998 | 28.30 | 
| Apr 1, 1998 | 28.26 | 
| Mar 1, 1998 | 27.23 | 
| Feb 1, 1998 | 25.85 | 
| Jan 1, 1998 | 24.29 | 
| Dec 1, 1997 | 24.23 | 
| Nov 1, 1997 | 23.46 | 
| Oct 1, 1997 | 23.58 | 
| Sep 1, 1997 | 23.06 | 
| Aug 1, 1997 | 22.83 | 
| Jul 1, 1997 | 22.80 | 
| Jun 1, 1997 | 21.61 | 
| May 1, 1997 | 20.60 | 
| Apr 1, 1997 | 18.94 | 
| Mar 1, 1997 | 19.69 | 
| Feb 1, 1997 | 20.09 | 
| Jan 1, 1997 | 19.53 | 
| Dec 1, 1996 | 19.19 | 
| Nov 1, 1996 | 19.45 | 
| Oct 1, 1996 | 19.00 | 
| Sep 1, 1996 | 18.75 | 
| Aug 1, 1996 | 18.60 | 
| Jul 1, 1996 | 18.26 | 
| Jun 1, 1996 | 19.15 | 
| May 1, 1996 | 19.10 | 
| Apr 1, 1996 | 18.85 | 
| Mar 1, 1996 | 19.01 | 
| Feb 1, 1996 | 19.10 | 
| Jan 1, 1996 | 18.08 | 
| Dec 1, 1995 | 18.10 | 
| Nov 1, 1995 | 17.33 | 
| Oct 1, 1995 | 16.76 | 
| Sep 1, 1995 | 16.45 | 
| Aug 1, 1995 | 16.01 | 
| Jul 1, 1995 | 16.07 | 
| Jun 1, 1995 | 15.67 | 
| May 1, 1995 | 15.50 | 
| Apr 1, 1995 | 15.31 | 
| Mar 1, 1995 | 15.15 | 
| Feb 1, 1995 | 15.11 | 
| Jan 1, 1995 | 14.89 | 
| Dec 1, 1994 | 14.88 | 
| Nov 1, 1994 | 15.62 | 
| Oct 1, 1994 | 16.32 | 
| Sep 1, 1994 | 17.09 | 
| Aug 1, 1994 | 17.44 | 
| Jul 1, 1994 | 17.42 | 
| Jun 1, 1994 | 18.05 | 
| May 1, 1994 | 18.50 | 
| Apr 1, 1994 | 19.00 | 
| Mar 1, 1994 | 20.42 | 
| Feb 1, 1994 | 21.02 | 
| Jan 1, 1994 | 21.34 | 
| Dec 1, 1993 | 21.29 | 
| Nov 1, 1993 | 21.63 | 
| Oct 1, 1993 | 22.19 | 
| Sep 1, 1993 | 22.50 | 
| Aug 1, 1993 | 22.65 | 
| Jul 1, 1993 | 22.72 | 
| Jun 1, 1993 | 23.18 | 
| May 1, 1993 | 22.83 | 
| Apr 1, 1993 | 22.53 | 
| Mar 1, 1993 | 22.69 | 
| Feb 1, 1993 | 22.55 | 
| Jan 1, 1993 | 22.50 | 
| Dec 1, 1992 | 22.82 | 
| Nov 1, 1992 | 22.56 | 
| Oct 1, 1992 | 22.43 | 
| Sep 1, 1992 | 23.20 | 
| Aug 1, 1992 | 23.60 | 
| Jul 1, 1992 | 23.88 | 
| Jun 1, 1992 | 23.95 | 
| May 1, 1992 | 24.75 | 
| Apr 1, 1992 | 24.73 | 
| Mar 1, 1992 | 25.16 | 
| Feb 1, 1992 | 25.60 | 
| Jan 1, 1992 | 25.93 | 
| Dec 1, 1991 | 24.33 | 
| Nov 1, 1991 | 23.27 | 
| Oct 1, 1991 | 22.49 | 
| Sep 1, 1991 | 21.73 | 
| Aug 1, 1991 | 21.22 | 
| Jul 1, 1991 | 20.14 | 
| Jun 1, 1991 | 19.49 | 
| May 1, 1991 | 18.98 | 
| Apr 1, 1991 | 18.58 | 
| Mar 1, 1991 | 17.78 | 
| Feb 1, 1991 | 17.19 | 
| Jan 1, 1991 | 15.35 | 
| Dec 1, 1990 | 15.41 | 
| Nov 1, 1990 | 14.68 | 
| Oct 1, 1990 | 14.21 | 
| Sep 1, 1990 | 14.51 | 
| Aug 1, 1990 | 15.33 | 
| Jul 1, 1990 | 16.81 | 
| Jun 1, 1990 | 16.95 | 
| May 1, 1990 | 16.37 | 
| Apr 1, 1990 | 15.70 | 
| Mar 1, 1990 | 15.62 | 
| Feb 1, 1990 | 14.97 | 
| Jan 1, 1990 | 15.13 | 
| Dec 1, 1989 | 15.24 | 
| Nov 1, 1989 | 14.70 | 
| Oct 1, 1989 | 14.84 | 
| Sep 1, 1989 | 14.66 | 
| Aug 1, 1989 | 14.32 | 
| Jul 1, 1989 | 13.43 | 
| Jun 1, 1989 | 12.84 | 
| May 1, 1989 | 12.49 | 
| Apr 1, 1989 | 12.07 | 
| Mar 1, 1989 | 11.73 | 
| Feb 1, 1989 | 11.97 | 
| Jan 1, 1989 | 11.82 | 
| Dec 1, 1988 | 11.64 | 
| Nov 1, 1988 | 11.57 | 
| Oct 1, 1988 | 12.02 | 
| Sep 1, 1988 | 11.79 | 
| Aug 1, 1988 | 11.78 | 
| Jul 1, 1988 | 12.22 | 
| Jun 1, 1988 | 12.49 | 
| May 1, 1988 | 12.41 | 
| Apr 1, 1988 | 13.39 | 
| Mar 1, 1988 | 14.29 | 
| Feb 1, 1988 | 14.16 | 
| Jan 1, 1988 | 14.02 | 
| Dec 1, 1987 | 13.77 | 
| Nov 1, 1987 | 14.45 | 
| Oct 1, 1987 | 17.08 | 
| Sep 1, 1987 | 20.09 | 
| Aug 1, 1987 | 21.42 | 
| Jul 1, 1987 | 20.81 | 
| Jun 1, 1987 | 20.90 | 
| May 1, 1987 | 19.74 | 
| Apr 1, 1987 | 19.45 | 
| Mar 1, 1987 | 19.37 | 
| Feb 1, 1987 | 18.86 | 
| Jan 1, 1987 | 18.01 | 
| Dec 1, 1986 | 17.17 | 
| Nov 1, 1986 | 16.78 | 
| Oct 1, 1986 | 16.12 | 
| Sep 1, 1986 | 16.05 | 
| Aug 1, 1986 | 16.55 | 
| Jul 1, 1986 | 16.28 | 
| Jun 1, 1986 | 16.68 | 
| May 1, 1986 | 16.28 | 
| Apr 1, 1986 | 16.32 | 
| Mar 1, 1986 | 16.00 | 
| Feb 1, 1986 | 15.08 | 
| Jan 1, 1986 | 14.28 | 
| Dec 1, 1985 | 14.19 | 
| Nov 1, 1985 | 13.33 | 
| Oct 1, 1985 | 12.39 | 
| Sep 1, 1985 | 12.09 | 
| Aug 1, 1985 | 12.26 | 
| Jul 1, 1985 | 12.43 | 
| Jun 1, 1985 | 12.10 | 
| May 1, 1985 | 11.65 | 
| Apr 1, 1985 | 11.20 | 
| Mar 1, 1985 | 10.95 | 
| Feb 1, 1985 | 10.98 | 
| Jan 1, 1985 | 10.36 | 
| Dec 1, 1984 | 9.89 | 
| Nov 1, 1984 | 10.01 | 
| Oct 1, 1984 | 9.94 | 
| Sep 1, 1984 | 10.03 | 
| Aug 1, 1984 | 10.00 | 
| Jul 1, 1984 | 9.26 | 
| Jun 1, 1984 | 9.45 | 
| May 1, 1984 | 9.86 | 
| Apr 1, 1984 | 10.12 | 
| Mar 1, 1984 | 10.31 | 
| Feb 1, 1984 | 10.59 | 
| Jan 1, 1984 | 11.52 | 
| Dec 1, 1983 | 11.72 | 
| Nov 1, 1983 | 11.98 | 
| Oct 1, 1983 | 12.38 | 
| Sep 1, 1983 | 12.57 | 
| Aug 1, 1983 | 12.43 | 
| Jul 1, 1983 | 13.02 | 
| Jun 1, 1983 | 13.22 | 
| May 1, 1983 | 13.09 | 
| Apr 1, 1983 | 12.64 | 
| Mar 1, 1983 | 12.23 | 
| Feb 1, 1983 | 11.75 | 
| Jan 1, 1983 | 11.48 | 
| Dec 1, 1982 | 11.03 | 
| Nov 1, 1982 | 10.67 | 
| Oct 1, 1982 | 10.01 | 
| Sep 1, 1982 | 9.03 | 
| Aug 1, 1982 | 7.97 | 
| Jul 1, 1982 | 7.83 | 
| Jun 1, 1982 | 7.74 | 
| May 1, 1982 | 8.09 | 
| Apr 1, 1982 | 7.97 | 
| Mar 1, 1982 | 7.48 | 
| Feb 1, 1982 | 7.64 | 
| Jan 1, 1982 | 7.73 | 
| Dec 1, 1981 | 8.06 | 
| Nov 1, 1981 | 8.02 | 
| Oct 1, 1981 | 7.83 | 
| Sep 1, 1981 | 7.75 | 
| Aug 1, 1981 | 8.54 | 
| Jul 1, 1981 | 8.55 | 
| Jun 1, 1981 | 8.81 | 
| May 1, 1981 | 8.86 | 
| Apr 1, 1981 | 9.13 | 
| Mar 1, 1981 | 9.14 | 
| Feb 1, 1981 | 8.76 | 
| Jan 1, 1981 | 9.02 | 
| Dec 1, 1980 | 9.01 | 
| Nov 1, 1980 | 9.19 | 
| Oct 1, 1980 | 8.86 | 
| Sep 1, 1980 | 8.64 | 
| Aug 1, 1980 | 8.38 | 
| Jul 1, 1980 | 8.07 | 
| Jun 1, 1980 | 7.67 | 
| May 1, 1980 | 7.15 | 
| Apr 1, 1980 | 6.79 | 
| Mar 1, 1980 | 6.85 | 
| Feb 1, 1980 | 7.61 | 
| Jan 1, 1980 | 7.39 | 
| Dec 1, 1979 | 7.25 | 
| Nov 1, 1979 | 7.01 | 
| Oct 1, 1979 | 7.11 | 
| Sep 1, 1979 | 7.42 | 
| Aug 1, 1979 | 7.45 | 
| Jul 1, 1979 | 7.23 | 
| Jun 1, 1979 | 7.27 | 
| May 1, 1979 | 7.25 | 
| Apr 1, 1979 | 7.55 | 
| Mar 1, 1979 | 7.53 | 
| Feb 1, 1979 | 7.57 | 
| Jan 1, 1979 | 7.88 | 
| Dec 1, 1978 | 7.79 | 
| Nov 1, 1978 | 7.84 | 
| Oct 1, 1978 | 8.51 | 
| Sep 1, 1978 | 8.98 | 
| Aug 1, 1978 | 9.07 | 
| Jul 1, 1978 | 8.57 | 
| Jun 1, 1978 | 8.70 | 
| May 1, 1978 | 8.75 | 
| Apr 1, 1978 | 8.41 | 
| Mar 1, 1978 | 8.13 | 
| Feb 1, 1978 | 8.16 | 
| Jan 1, 1978 | 8.28 | 
| Dec 1, 1977 | 8.62 | 
| Nov 1, 1977 | 8.71 | 
| Oct 1, 1977 | 8.70 | 
| Sep 1, 1977 | 8.99 | 
| Aug 1, 1977 | 9.21 | 
| Jul 1, 1977 | 9.53 | 
| Jun 1, 1977 | 9.53 | 
| May 1, 1977 | 9.58 | 
| Apr 1, 1977 | 9.72 | 
| Mar 1, 1977 | 9.98 | 
| Feb 1, 1977 | 10.08 | 
| Jan 1, 1977 | 10.41 | 
| Dec 1, 1976 | 10.57 | 
| Nov 1, 1976 | 10.34 | 
| Oct 1, 1976 | 10.54 | 
| Sep 1, 1976 | 11.05 | 
| Aug 1, 1976 | 10.93 | 
| Jul 1, 1976 | 11.14 | 
| Jun 1, 1976 | 11.01 | 
| May 1, 1976 | 11.18 | 
| Apr 1, 1976 | 11.51 | 
| Mar 1, 1976 | 11.67 | 
| Feb 1, 1976 | 11.94 | 
| Jan 1, 1976 | 11.82 | 
| Dec 1, 1975 | 11.14 | 
| Nov 1, 1975 | 11.41 | 
| Oct 1, 1975 | 11.32 | 
| Sep 1, 1975 | 10.91 | 
| Aug 1, 1975 | 10.95 | 
| Jul 1, 1975 | 11.72 | 
| Jun 1, 1975 | 11.61 | 
| May 1, 1975 | 11.09 | 
| Apr 1, 1975 | 10.22 | 
| Mar 1, 1975 | 9.91 | 
| Feb 1, 1975 | 9.32 | 
| Jan 1, 1975 | 8.30 | 
| Dec 1, 1974 | 7.54 | 
| Nov 1, 1974 | 8.00 | 
| Oct 1, 1974 | 7.68 | 
| Sep 1, 1974 | 7.48 | 
| Aug 1, 1974 | 8.46 | 
| Jul 1, 1974 | 8.95 | 
| Jun 1, 1974 | 10.27 | 
| May 1, 1974 | 10.41 | 
| Apr 1, 1974 | 10.89 | 
| Mar 1, 1974 | 11.66 | 
| Feb 1, 1974 | 11.27 | 
| Jan 1, 1974 | 11.68 | 
| Dec 1, 1973 | 11.62 | 
| Nov 1, 1973 | 12.74 | 
| Oct 1, 1973 | 13.99 | 
| Sep 1, 1973 | 13.73 | 
| Aug 1, 1973 | 13.77 | 
| Jul 1, 1973 | 14.33 | 
| Jun 1, 1973 | 14.50 | 
| May 1, 1973 | 15.13 | 
| Apr 1, 1973 | 15.89 | 
| Mar 1, 1973 | 16.53 | 
| Feb 1, 1973 | 17.11 | 
| Jan 1, 1973 | 18.09 | 
| Dec 1, 1972 | 18.30 | 
| Nov 1, 1972 | 18.19 | 
| Oct 1, 1972 | 17.58 | 
| Sep 1, 1972 | 17.82 | 
| Aug 1, 1972 | 18.25 | 
| Jul 1, 1972 | 17.79 | 
| Jun 1, 1972 | 18.09 | 
| May 1, 1972 | 18.20 | 
| Apr 1, 1972 | 18.56 | 
| Mar 1, 1972 | 18.54 | 
| Feb 1, 1972 | 18.22 | 
| Jan 1, 1972 | 18.01 | 
| Dec 1, 1971 | 17.40 | 
| Nov 1, 1971 | 16.54 | 
| Oct 1, 1971 | 17.62 | 
| Sep 1, 1971 | 18.31 | 
| Aug 1, 1971 | 18.03 | 
| Jul 1, 1971 | 18.48 | 
| Jun 1, 1971 | 18.74 | 
| May 1, 1971 | 19.22 | 
| Apr 1, 1971 | 19.61 | 
| Mar 1, 1971 | 19.08 | 
| Feb 1, 1971 | 18.71 | 
| Jan 1, 1971 | 18.12 | 
| Dec 1, 1970 | 17.55 | 
| Nov 1, 1970 | 16.19 | 
| Oct 1, 1970 | 15.97 | 
| Sep 1, 1970 | 15.41 | 
| Aug 1, 1970 | 14.39 | 
| Jul 1, 1970 | 13.85 | 
| Jun 1, 1970 | 13.69 | 
| May 1, 1970 | 13.69 | 
| Apr 1, 1970 | 15.37 | 
| Mar 1, 1970 | 15.75 | 
| Feb 1, 1970 | 15.35 | 
| Jan 1, 1970 | 15.76 | 
| Dec 1, 1969 | 15.76 | 
| Nov 1, 1969 | 16.54 | 
| Oct 1, 1969 | 16.32 | 
| Sep 1, 1969 | 16.05 | 
| Aug 1, 1969 | 16.04 | 
| Jul 1, 1969 | 16.17 | 
| Jun 1, 1969 | 16.98 | 
| May 1, 1969 | 17.93 | 
| Apr 1, 1969 | 17.39 | 
| Mar 1, 1969 | 17.06 | 
| Feb 1, 1969 | 17.50 | 
| Jan 1, 1969 | 17.65 | 
| Dec 1, 1968 | 18.49 | 
| Nov 1, 1968 | 18.41 | 
| Oct 1, 1968 | 18.23 | 
| Sep 1, 1968 | 17.90 | 
| Aug 1, 1968 | 17.43 | 
| Jul 1, 1968 | 17.91 | 
| Jun 1, 1968 | 18.04 | 
| May 1, 1968 | 17.71 | 
| Apr 1, 1968 | 17.45 | 
| Mar 1, 1968 | 16.38 | 
| Feb 1, 1968 | 16.80 | 
| Jan 1, 1968 | 17.71 | 
| Dec 1, 1967 | 17.88 | 
| Nov 1, 1967 | 17.42 | 
| Oct 1, 1967 | 18.02 | 
| Sep 1, 1967 | 18.08 | 
| Aug 1, 1967 | 17.79 | 
| Jul 1, 1967 | 17.48 | 
| Jun 1, 1967 | 17.15 | 
| May 1, 1967 | 17.24 | 
| Apr 1, 1967 | 16.81 | 
| Mar 1, 1967 | 16.41 | 
| Feb 1, 1967 | 15.93 | 
| Jan 1, 1967 | 15.31 | 
| Dec 1, 1966 | 14.65 | 
| Nov 1, 1966 | 14.63 | 
| Oct 1, 1966 | 13.96 | 
| Sep 1, 1966 | 14.12 | 
| Aug 1, 1966 | 14.68 | 
| Jul 1, 1966 | 15.67 | 
| Jun 1, 1966 | 15.76 | 
| May 1, 1966 | 16.01 | 
| Apr 1, 1966 | 17.03 | 
| Mar 1, 1966 | 16.64 | 
| Feb 1, 1966 | 17.52 | 
| Jan 1, 1966 | 17.81 | 
| Dec 1, 1965 | 17.67 | 
| Nov 1, 1965 | 18.00 | 
| Oct 1, 1965 | 18.10 | 
| Sep 1, 1965 | 17.95 | 
| Aug 1, 1965 | 17.53 | 
| Jul 1, 1965 | 17.38 | 
| Jun 1, 1965 | 17.57 | 
| May 1, 1965 | 18.65 | 
| Apr 1, 1965 | 18.59 | 
| Mar 1, 1965 | 18.55 | 
| Feb 1, 1965 | 18.71 | 
| Jan 1, 1965 | 18.75 | 
| Dec 1, 1964 | 18.45 | 
| Nov 1, 1964 | 18.89 | 
| Oct 1, 1964 | 18.87 | 
| Sep 1, 1964 | 18.66 | 
| Aug 1, 1964 | 18.54 | 
| Jul 1, 1964 | 19.01 | 
| Jun 1, 1964 | 18.53 | 
| May 1, 1964 | 18.86 | 
| Apr 1, 1964 | 18.90 | 
| Mar 1, 1964 | 18.85 | 
| Feb 1, 1964 | 18.75 | 
| Jan 1, 1964 | 18.77 | 
| Dec 1, 1963 | 18.45 | 
| Nov 1, 1963 | 18.16 | 
| Oct 1, 1963 | 18.35 | 
| Sep 1, 1963 | 18.40 | 
| Aug 1, 1963 | 18.11 | 
| Jul 1, 1963 | 17.80 | 
| Jun 1, 1963 | 18.26 | 
| May 1, 1963 | 18.47 | 
| Apr 1, 1963 | 18.32 | 
| Mar 1, 1963 | 17.70 | 
| Feb 1, 1963 | 17.83 | 
| Jan 1, 1963 | 17.66 | 
| Dec 1, 1962 | 17.07 | 
| Nov 1, 1962 | 16.57 | 
| Oct 1, 1962 | 15.70 | 
| Sep 1, 1962 | 16.43 | 
| Aug 1, 1962 | 16.67 | 
| Jul 1, 1962 | 16.32 | 
| Jun 1, 1962 | 16.03 | 
| May 1, 1962 | 18.33 | 
| Apr 1, 1962 | 20.00 | 
| Mar 1, 1962 | 20.86 | 
| Feb 1, 1962 | 21.21 | 
| Jan 1, 1962 | 21.25 | 
| Dec 1, 1961 | 22.49 | 
| Nov 1, 1961 | 22.61 | 
| Oct 1, 1961 | 21.96 | 
| Sep 1, 1961 | 22.05 | 
| Aug 1, 1961 | 22.27 | 
| Jul 1, 1961 | 21.55 | 
| Jun 1, 1961 | 21.66 | 
| May 1, 1961 | 21.80 | 
| Apr 1, 1961 | 21.44 | 
| Mar 1, 1961 | 20.75 | 
| Feb 1, 1961 | 19.74 | 
| Jan 1, 1961 | 18.60 | 
| Dec 1, 1960 | 17.37 | 
| Nov 1, 1960 | 16.96 | 
| Oct 1, 1960 | 16.43 | 
| Sep 1, 1960 | 16.76 | 
| Aug 1, 1960 | 17.30 | 
| Jul 1, 1960 | 17.11 | 
| Jun 1, 1960 | 17.56 | 
| May 1, 1960 | 16.72 | 
| Apr 1, 1960 | 16.65 | 
| Mar 1, 1960 | 16.23 | 
| Feb 1, 1960 | 16.45 | 
| Jan 1, 1960 | 17.12 | 
| Dec 1, 1959 | 17.42 | 
| Nov 1, 1959 | 16.82 | 
| Oct 1, 1959 | 16.68 | 
| Sep 1, 1959 | 16.63 | 
| Aug 1, 1959 | 17.37 | 
| Jul 1, 1959 | 17.52 | 
| Jun 1, 1959 | 16.90 | 
| May 1, 1959 | 17.55 | 
| Apr 1, 1959 | 17.81 | 
| Mar 1, 1959 | 18.06 | 
| Feb 1, 1959 | 18.04 | 
| Jan 1, 1959 | 18.77 | 
| Dec 1, 1958 | 18.51 | 
| Nov 1, 1958 | 18.19 | 
| Oct 1, 1958 | 17.67 | 
| Sep 1, 1958 | 17.00 | 
| Aug 1, 1958 | 16.47 | 
| Jul 1, 1958 | 15.78 | 
| Jun 1, 1958 | 15.27 | 
| May 1, 1958 | 14.57 | 
| Apr 1, 1958 | 13.79 | 
| Mar 1, 1958 | 13.41 | 
| Feb 1, 1958 | 12.83 | 
| Jan 1, 1958 | 12.49 | 
| Dec 1, 1957 | 11.97 | 
| Nov 1, 1957 | 11.86 | 
| Oct 1, 1957 | 12.00 | 
| Sep 1, 1957 | 12.67 | 
| Aug 1, 1957 | 13.27 | 
| Jul 1, 1957 | 14.12 | 
| Jun 1, 1957 | 13.90 | 
| May 1, 1957 | 13.71 | 
| Apr 1, 1957 | 13.22 | 
| Mar 1, 1957 | 12.95 | 
| Feb 1, 1957 | 12.77 | 
| Jan 1, 1957 | 13.34 | 
| Dec 1, 1956 | 13.62 | 
| Nov 1, 1956 | 13.35 | 
| Oct 1, 1956 | 13.43 | 
| Sep 1, 1956 | 13.54 | 
| Aug 1, 1956 | 13.83 | 
| Jul 1, 1956 | 13.73 | 
| Jun 1, 1956 | 12.85 | 
| May 1, 1956 | 12.82 | 
| Apr 1, 1956 | 13.13 | 
| Mar 1, 1956 | 12.87 | 
| Feb 1, 1956 | 12.12 | 
| Jan 1, 1956 | 12.12 | 
| Dec 1, 1955 | 12.53 | 
| Nov 1, 1955 | 12.63 | 
| Oct 1, 1955 | 12.03 | 
| Sep 1, 1955 | 12.89 | 
| Aug 1, 1955 | 12.60 | 
| Jul 1, 1955 | 12.96 | 
| Jun 1, 1955 | 12.35 | 
| May 1, 1955 | 12.00 | 
| Apr 1, 1955 | 12.39 | 
| Mar 1, 1955 | 12.33 | 
| Feb 1, 1955 | 12.70 | 
| Jan 1, 1955 | 12.56 | 
| Dec 1, 1954 | 12.62 | 
| Nov 1, 1954 | 12.28 | 
| Oct 1, 1954 | 12.02 | 
| Sep 1, 1954 | 11.96 | 
| Aug 1, 1954 | 11.70 | 
| Jul 1, 1954 | 11.49 | 
| Jun 1, 1954 | 11.05 | 
| May 1, 1954 | 11.06 | 
| Apr 1, 1954 | 10.74 | 
| Mar 1, 1954 | 10.42 | 
| Feb 1, 1954 | 10.26 | 
| Jan 1, 1954 | 10.09 | 
| Dec 1, 1953 | 9.89 | 
| Nov 1, 1953 | 9.71 | 
| Oct 1, 1953 | 9.45 | 
| Sep 1, 1953 | 9.13 | 
| Aug 1, 1953 | 9.61 | 
| Jul 1, 1953 | 9.63 | 
| Jun 1, 1953 | 9.54 | 
| May 1, 1953 | 10.00 | 
| Apr 1, 1953 | 10.06 | 
| Mar 1, 1953 | 10.70 | 
| Feb 1, 1953 | 10.69 | 
| Jan 1, 1953 | 10.86 | 
| Dec 1, 1952 | 10.85 | 
| Nov 1, 1952 | 10.49 | 
| Oct 1, 1952 | 10.22 | 
| Sep 1, 1952 | 10.50 | 
| Aug 1, 1952 | 10.70 | 
| Jul 1, 1952 | 10.69 | 
| Jun 1, 1952 | 10.42 | 
| May 1, 1952 | 10.06 | 
| Apr 1, 1952 | 9.97 | 
| Mar 1, 1952 | 9.92 | 
| Feb 1, 1952 | 9.84 | 
| Jan 1, 1952 | 9.97 | 
| Dec 1, 1951 | 9.59 | 
| Nov 1, 1951 | 9.22 | 
| Oct 1, 1951 | 9.39 | 
| Sep 1, 1951 | 9.35 | 
| Aug 1, 1951 | 8.87 | 
| Jul 1, 1951 | 8.28 | 
| Jun 1, 1951 | 7.92 | 
| May 1, 1951 | 7.96 | 
| Apr 1, 1951 | 7.85 | 
| Mar 1, 1951 | 7.64 | 
| Feb 1, 1951 | 7.76 | 
| Jan 1, 1951 | 7.48 | 
| Dec 1, 1950 | 6.95 | 
| Nov 1, 1950 | 7.08 | 
| Oct 1, 1950 | 7.20 | 
| Sep 1, 1950 | 7.01 | 
| Aug 1, 1950 | 6.93 | 
| Jul 1, 1950 | 6.68 | 
| Jun 1, 1950 | 7.38 | 
| May 1, 1950 | 7.43 | 
| Apr 1, 1950 | 7.35 | 
| Mar 1, 1950 | 7.32 | 
| Feb 1, 1950 | 7.31 | 
| Jan 1, 1950 | 7.22 | 
| Dec 1, 1949 | 7.13 | 
| Nov 1, 1949 | 6.87 | 
| Oct 1, 1949 | 6.71 | 
| Sep 1, 1949 | 6.48 | 
| Aug 1, 1949 | 6.39 | 
| Jul 1, 1949 | 6.16 | 
| Jun 1, 1949 | 5.82 | 
| May 1, 1949 | 6.18 | 
| Apr 1, 1949 | 6.24 | 
| Mar 1, 1949 | 6.26 | 
| Feb 1, 1949 | 6.29 | 
| Jan 1, 1949 | 6.62 | 
| Dec 1, 1948 | 6.63 | 
| Nov 1, 1948 | 6.90 | 
| Oct 1, 1948 | 7.55 | 
| Sep 1, 1948 | 7.61 | 
| Aug 1, 1948 | 7.97 | 
| Jul 1, 1948 | 8.51 | 
| Jun 1, 1948 | 9.04 | 
| May 1, 1948 | 8.92 | 
| Apr 1, 1948 | 8.75 | 
| Mar 1, 1948 | 8.36 | 
| Feb 1, 1948 | 8.41 | 
| Jan 1, 1948 | 9.02 | 
| Dec 1, 1947 | 9.34 | 
| Nov 1, 1947 | 9.60 | 
| Oct 1, 1947 | 9.84 | 
| Sep 1, 1947 | 9.72 | 
| Aug 1, 1947 | 10.22 | 
| Jul 1, 1947 | 10.68 | 
| Jun 1, 1947 | 10.31 | 
| May 1, 1947 | 10.37 | 
| Apr 1, 1947 | 11.00 | 
| Mar 1, 1947 | 11.94 | 
| Feb 1, 1947 | 13.17 | 
| Jan 1, 1947 | 13.46 | 
| Dec 1, 1946 | 14.27 | 
| Nov 1, 1946 | 14.64 | 
| Oct 1, 1946 | 15.58 | 
| Sep 1, 1946 | 16.96 | 
| Aug 1, 1946 | 20.27 | 
| Jul 1, 1946 | 21.07 | 
| Jun 1, 1946 | 22.12 | 
| May 1, 1946 | 21.74 | 
| Apr 1, 1946 | 21.20 | 
| Mar 1, 1946 | 19.48 | 
| Feb 1, 1946 | 19.64 | 
| Jan 1, 1946 | 19.17 | 
| Dec 1, 1945 | 18.05 | 
| Nov 1, 1945 | 17.57 | 
| Oct 1, 1945 | 16.84 | 
| Sep 1, 1945 | 16.00 | 
| Aug 1, 1945 | 14.93 | 
| Jul 1, 1945 | 14.83 | 
| Jun 1, 1945 | 15.09 | 
| May 1, 1945 | 15.02 | 
| Apr 1, 1945 | 14.67 | 
| Mar 1, 1945 | 14.51 | 
| Feb 1, 1945 | 14.67 | 
| Jan 1, 1945 | 14.35 | 
| Dec 1, 1944 | 14.09 | 
| Nov 1, 1944 | 13.93 | 
| Oct 1, 1944 | 14.19 | 
| Sep 1, 1944 | 14.00 | 
| Aug 1, 1944 | 14.13 | 
| Jul 1, 1944 | 14.23 | 
| Jun 1, 1944 | 13.77 | 
| May 1, 1944 | 13.10 | 
| Apr 1, 1944 | 12.83 | 
| Mar 1, 1944 | 13.01 | 
| Feb 1, 1944 | 12.61 | 
| Jan 1, 1944 | 12.65 | 
| Dec 1, 1943 | 12.21 | 
| Nov 1, 1943 | 11.48 | 
| Oct 1, 1943 | 11.50 | 
| Sep 1, 1943 | 11.10 | 
| Aug 1, 1943 | 10.80 | 
| Jul 1, 1943 | 11.30 | 
| Jun 1, 1943 | 11.00 | 
| May 1, 1943 | 10.91 | 
| Apr 1, 1943 | 10.59 | 
| Mar 1, 1943 | 10.35 | 
| Feb 1, 1943 | 10.12 | 
| Jan 1, 1943 | 9.67 | 
| Dec 1, 1942 | 9.24 | 
| Nov 1, 1942 | 9.47 | 
| Oct 1, 1942 | 9.61 | 
| Sep 1, 1942 | 9.23 | 
| Aug 1, 1942 | 9.01 | 
| Jul 1, 1942 | 8.94 | 
| Jun 1, 1942 | 8.50 | 
| May 1, 1942 | 7.93 | 
| Apr 1, 1942 | 7.69 | 
| Mar 1, 1942 | 7.87 | 
| Feb 1, 1942 | 8.01 | 
| Jan 1, 1942 | 7.97 | 
| Dec 1, 1941 | 7.55 | 
| Nov 1, 1941 | 8.01 | 
| Oct 1, 1941 | 8.33 | 
| Sep 1, 1941 | 8.61 | 
| Aug 1, 1941 | 8.83 | 
| Jul 1, 1941 | 9.13 | 
| Jun 1, 1941 | 8.95 | 
| May 1, 1941 | 8.73 | 
| Apr 1, 1941 | 9.01 | 
| Mar 1, 1941 | 9.39 | 
| Feb 1, 1941 | 9.36 | 
| Jan 1, 1941 | 10.02 | 
| Dec 1, 1940 | 10.03 | 
| Nov 1, 1940 | 10.36 | 
| Oct 1, 1940 | 10.03 | 
| Sep 1, 1940 | 9.84 | 
| Aug 1, 1940 | 9.56 | 
| Jul 1, 1940 | 9.48 | 
| Jun 1, 1940 | 9.30 | 
| May 1, 1940 | 10.34 | 
| Apr 1, 1940 | 12.19 | 
| Mar 1, 1940 | 12.27 | 
| Feb 1, 1940 | 12.73 | 
| Jan 1, 1940 | 13.23 | 
| Dec 1, 1939 | 13.74 | 
| Nov 1, 1939 | 14.56 | 
| Oct 1, 1939 | 15.36 | 
| Sep 1, 1939 | 15.77 | 
| Aug 1, 1939 | 14.55 | 
| Jul 1, 1939 | 15.08 | 
| Jun 1, 1939 | 15.04 | 
| May 1, 1939 | 15.11 | 
| Apr 1, 1939 | 14.90 | 
| Mar 1, 1939 | 17.45 | 
| Feb 1, 1939 | 18.06 | 
| Jan 1, 1939 | 18.84 | 
| Dec 1, 1938 | 19.83 | 
| Nov 1, 1938 | 20.64 | 
| Oct 1, 1938 | 20.84 | 
| Sep 1, 1938 | 18.95 | 
| Aug 1, 1938 | 18.37 | 
| Jul 1, 1938 | 17.00 | 
| Jun 1, 1938 | 13.26 | 
| May 1, 1938 | 11.93 | 
| Apr 1, 1938 | 10.95 | 
| Mar 1, 1938 | 10.63 | 
| Feb 1, 1938 | 10.79 | 
| Jan 1, 1938 | 10.50 | 
| Dec 1, 1937 | 9.75 | 
| Nov 1, 1937 | 9.66 | 
| Oct 1, 1937 | 10.32 | 
| Sep 1, 1937 | 11.78 | 
| Aug 1, 1937 | 13.91 | 
| Jul 1, 1937 | 13.96 | 
| Jun 1, 1937 | 13.37 | 
| May 1, 1937 | 14.13 | 
| Apr 1, 1937 | 15.05 | 
| Mar 1, 1937 | 16.30 | 
| Feb 1, 1937 | 16.77 | 
| Jan 1, 1937 | 16.75 | 
| Dec 1, 1936 | 16.73 | 
| Nov 1, 1936 | 17.48 | 
| Oct 1, 1936 | 17.47 | 
| Sep 1, 1936 | 17.07 | 
| Aug 1, 1936 | 17.25 | 
| Jul 1, 1936 | 17.29 | 
| Jun 1, 1936 | 16.69 | 
| May 1, 1936 | 16.58 | 
| Apr 1, 1936 | 18.15 | 
| Mar 1, 1936 | 18.81 | 
| Feb 1, 1936 | 18.65 | 
| Jan 1, 1936 | 17.87 | 
| Dec 1, 1935 | 17.16 | 
| Nov 1, 1935 | 17.16 | 
| Oct 1, 1935 | 15.68 | 
| Sep 1, 1935 | 15.28 | 
| Aug 1, 1935 | 14.64 | 
| Jul 1, 1935 | 13.42 | 
| Jun 1, 1935 | 12.49 | 
| May 1, 1935 | 12.45 | 
| Apr 1, 1935 | 11.95 | 
| Mar 1, 1935 | 11.52 | 
| Feb 1, 1935 | 13.82 | 
| Jan 1, 1935 | 16.25 | 
| Dec 1, 1934 | 18.90 | 
| Nov 1, 1934 | 18.94 | 
| Oct 1, 1934 | 18.58 | 
| Sep 1, 1934 | 18.60 | 
| Aug 1, 1934 | 19.23 | 
| Jul 1, 1934 | 20.18 | 
| Jun 1, 1934 | 21.38 | 
| May 1, 1934 | 21.29 | 
| Apr 1, 1934 | 23.91 | 
| Mar 1, 1934 | 23.73 | 
| Feb 1, 1934 | 25.25 | 
| Jan 1, 1934 | 23.73 | 
| Dec 1, 1933 | 22.66 | 
| Nov 1, 1933 | 22.35 | 
| Oct 1, 1933 | 21.95 | 
| Sep 1, 1933 | 24.46 | 
| Aug 1, 1933 | 24.81 | 
| Jul 1, 1933 | 26.27 | 
| Jun 1, 1933 | 24.45 | 
| May 1, 1933 | 20.99 | 
| Apr 1, 1933 | 16.40 | 
| Mar 1, 1933 | 14.92 | 
| Feb 1, 1933 | 15.06 | 
| Jan 1, 1933 | 17.19 | 
| Dec 1, 1932 | 16.63 | 
| Nov 1, 1932 | 16.52 | 
| Oct 1, 1932 | 16.06 | 
| Sep 1, 1932 | 17.96 | 
| Aug 1, 1932 | 15.80 | 
| Jul 1, 1932 | 10.16 | 
| Jun 1, 1932 | 9.35 | 
| May 1, 1932 | 10.46 | 
| Apr 1, 1932 | 11.56 | 
| Mar 1, 1932 | 14.75 | 
| Feb 1, 1932 | 14.27 | 
| Jan 1, 1932 | 13.99 | 
| Dec 1, 1931 | 13.84 | 
| Nov 1, 1931 | 16.23 | 
| Oct 1, 1931 | 15.30 | 
| Sep 1, 1931 | 16.90 | 
| Aug 1, 1931 | 19.04 | 
| Jul 1, 1931 | 18.86 | 
| Jun 1, 1931 | 17.56 | 
| May 1, 1931 | 17.48 | 
| Apr 1, 1931 | 18.66 | 
| Mar 1, 1931 | 19.92 | 
| Feb 1, 1931 | 18.90 | 
| Jan 1, 1931 | 17.00 | 
| Dec 1, 1930 | 15.99 | 
| Nov 1, 1930 | 16.25 | 
| Oct 1, 1930 | 16.64 | 
| Sep 1, 1930 | 18.39 | 
| Aug 1, 1930 | 17.57 | 
| Jul 1, 1930 | 17.03 | 
| Jun 1, 1930 | 16.68 | 
| May 1, 1930 | 17.83 | 
| Apr 1, 1930 | 18.22 | 
| Mar 1, 1930 | 16.51 | 
| Feb 1, 1930 | 15.35 | 
| Jan 1, 1930 | 13.94 | 
| Dec 1, 1929 | 13.29 | 
| Nov 1, 1929 | 12.94 | 
| Oct 1, 1929 | 17.81 | 
| Sep 1, 1929 | 20.17 | 
| Aug 1, 1929 | 19.63 | 
| Jul 1, 1929 | 18.81 | 
| Jun 1, 1929 | 17.49 | 
| May 1, 1929 | 17.38 | 
| Apr 1, 1929 | 17.35 | 
| Mar 1, 1929 | 17.68 | 
| Feb 1, 1929 | 17.62 | 
| Jan 1, 1929 | 17.77 | 
| Dec 1, 1928 | 16.78 | 
| Nov 1, 1928 | 16.99 | 
| Oct 1, 1928 | 16.18 | 
| Sep 1, 1928 | 16.14 | 
| Aug 1, 1928 | 15.33 | 
| Jul 1, 1928 | 15.11 | 
| Jun 1, 1928 | 15.28 | 
| May 1, 1928 | 16.37 | 
| Apr 1, 1928 | 16.17 | 
| Mar 1, 1928 | 15.51 | 
| Feb 1, 1928 | 15.00 | 
| Jan 1, 1928 | 15.47 | 
| Dec 1, 1927 | 15.73 | 
| Nov 1, 1927 | 15.22 | 
| Oct 1, 1927 | 14.73 | 
| Sep 1, 1927 | 14.82 | 
| Aug 1, 1927 | 13.90 | 
| Jul 1, 1927 | 13.08 | 
| Jun 1, 1927 | 12.67 | 
| May 1, 1927 | 12.39 | 
| Apr 1, 1927 | 11.87 | 
| Mar 1, 1927 | 11.48 | 
| Feb 1, 1927 | 11.22 | 
| Jan 1, 1927 | 10.90 | 
| Dec 1, 1926 | 10.88 | 
| Nov 1, 1926 | 10.63 | 
| Oct 1, 1926 | 10.48 | 
| Sep 1, 1926 | 10.72 | 
| Aug 1, 1926 | 10.56 | 
| Jul 1, 1926 | 10.14 | 
| Jun 1, 1926 | 9.73 | 
| May 1, 1926 | 9.28 | 
| Apr 1, 1926 | 9.21 | 
| Mar 1, 1926 | 9.46 | 
| Feb 1, 1926 | 10.15 | 
| Jan 1, 1926 | 10.13 | 
| Dec 1, 1925 | 9.97 | 
| Nov 1, 1925 | 10.02 | 
| Oct 1, 1925 | 9.93 | 
| Sep 1, 1925 | 9.84 | 
| Aug 1, 1925 | 9.84 | 
| Jul 1, 1925 | 9.94 | 
| Jun 1, 1925 | 9.91 | 
| May 1, 1925 | 9.98 | 
| Apr 1, 1925 | 9.91 | 
| Mar 1, 1925 | 10.29 | 
| Feb 1, 1925 | 10.85 | 
| Jan 1, 1925 | 11.06 | 
| Dec 1, 1924 | 10.92 | 
| Nov 1, 1924 | 10.32 | 
| Oct 1, 1924 | 9.73 | 
| Sep 1, 1924 | 9.81 | 
| Aug 1, 1924 | 9.87 | 
| Jul 1, 1924 | 9.50 | 
| Jun 1, 1924 | 9.04 | 
| May 1, 1924 | 8.83 | 
| Apr 1, 1924 | 8.82 | 
| Mar 1, 1924 | 8.99 | 
| Feb 1, 1924 | 9.13 | 
| Jan 1, 1924 | 9.05 | 
| Dec 1, 1923 | 8.72 | 
| Nov 1, 1923 | 8.65 | 
| Oct 1, 1923 | 8.62 | 
| Sep 1, 1923 | 8.98 | 
| Aug 1, 1923 | 9.17 | 
| Jul 1, 1923 | 9.38 | 
| Jun 1, 1923 | 9.99 | 
| May 1, 1923 | 10.69 | 
| Apr 1, 1923 | 11.57 | 
| Mar 1, 1923 | 12.37 | 
| Feb 1, 1923 | 12.57 | 
| Jan 1, 1923 | 12.46 | 
| Dec 1, 1922 | 12.72 | 
| Nov 1, 1922 | 13.40 | 
| Oct 1, 1922 | 14.86 | 
| Sep 1, 1922 | 15.36 | 
| Aug 1, 1922 | 15.86 | 
| Jul 1, 1922 | 16.26 | 
| Jun 1, 1922 | 17.24 | 
| May 1, 1922 | 18.68 | 
| Apr 1, 1922 | 19.40 | 
| Mar 1, 1922 | 19.85 | 
| Feb 1, 1922 | 20.91 | 
| Jan 1, 1922 | 22.58 | 
| Dec 1, 1921 | 25.21 | 
| Nov 1, 1921 | 21.23 | 
| Oct 1, 1921 | 17.87 | 
| Sep 1, 1921 | 15.83 | 
| Aug 1, 1921 | 14.02 | 
| Jul 1, 1921 | 13.00 | 
| Jun 1, 1921 | 12.02 | 
| May 1, 1921 | 12.12 | 
| Apr 1, 1921 | 10.97 | 
| Mar 1, 1921 | 10.23 | 
| Feb 1, 1921 | 9.87 | 
| Jan 1, 1921 | 9.39 | 
| Dec 1, 1920 | 8.51 | 
| Nov 1, 1920 | 9.23 | 
| Oct 1, 1920 | 9.59 | 
| Sep 1, 1920 | 9.45 | 
| Aug 1, 1920 | 9.01 | 
| Jul 1, 1920 | 9.26 | 
| Jun 1, 1920 | 9.16 | 
| May 1, 1920 | 9.20 | 
| Apr 1, 1920 | 9.70 | 
| Mar 1, 1920 | 9.66 | 
| Feb 1, 1920 | 8.92 | 
| Jan 1, 1920 | 9.61 | 
| Dec 1, 1919 | 9.59 | 
| Nov 1, 1919 | 9.83 | 
| Oct 1, 1919 | 10.07 | 
| Sep 1, 1919 | 9.53 | 
| Aug 1, 1919 | 9.34 | 
| Jul 1, 1919 | 9.96 | 
| Jun 1, 1919 | 9.59 | 
| May 1, 1919 | 9.30 | 
| Apr 1, 1919 | 8.65 | 
| Mar 1, 1919 | 8.33 | 
| Feb 1, 1919 | 8.04 | 
| Jan 1, 1919 | 7.97 | 
| Dec 1, 1918 | 7.98 | 
| Nov 1, 1918 | 7.95 | 
| Oct 1, 1918 | 7.57 | 
| Sep 1, 1918 | 7.09 | 
| Aug 1, 1918 | 6.97 | 
| Jul 1, 1918 | 6.76 | 
| Jun 1, 1918 | 6.56 | 
| May 1, 1918 | 6.42 | 
| Apr 1, 1918 | 6.09 | 
| Mar 1, 1918 | 6.03 | 
| Feb 1, 1918 | 6.03 | 
| Jan 1, 1918 | 5.74 | 
| Dec 1, 1917 | 5.31 | 
| Nov 1, 1917 | 5.41 | 
| Oct 1, 1917 | 5.81 | 
| Sep 1, 1917 | 6.05 | 
| Aug 1, 1917 | 6.26 | 
| Jul 1, 1917 | 6.35 | 
| Jun 1, 1917 | 6.43 | 
| May 1, 1917 | 6.21 | 
| Apr 1, 1917 | 6.34 | 
| Mar 1, 1917 | 6.34 | 
| Feb 1, 1917 | 6.07 | 
| Jan 1, 1917 | 6.34 | 
| Dec 1, 1916 | 6.41 | 
| Nov 1, 1916 | 6.92 | 
| Oct 1, 1916 | 7.02 | 
| Sep 1, 1916 | 7.08 | 
| Aug 1, 1916 | 7.08 | 
| Jul 1, 1916 | 7.33 | 
| Jun 1, 1916 | 7.77 | 
| May 1, 1916 | 8.05 | 
| Apr 1, 1916 | 8.27 | 
| Mar 1, 1916 | 8.80 | 
| Feb 1, 1916 | 9.31 | 
| Jan 1, 1916 | 9.99 | 
| Dec 1, 1915 | 10.77 | 
| Nov 1, 1915 | 11.13 | 
| Oct 1, 1915 | 11.15 | 
| Sep 1, 1915 | 10.96 | 
| Aug 1, 1915 | 10.99 | 
| Jul 1, 1915 | 10.97 | 
| Jun 1, 1915 | 11.49 | 
| May 1, 1915 | 11.87 | 
| Apr 1, 1915 | 12.72 | 
| Mar 1, 1915 | 12.41 | 
| Feb 1, 1915 | 12.72 | 
| Jan 1, 1915 | 13.60 | 
| Dec 1, 1914 | 14.13 | 
| Nov 1, 1914 | 14.51 | 
| Oct 1, 1914 | 14.27 | 
| Sep 1, 1914 | 14.03 | 
| Aug 1, 1914 | 13.80 | 
| Jul 1, 1914 | 13.57 | 
| Jun 1, 1914 | 14.14 | 
| May 1, 1914 | 13.98 | 
| Apr 1, 1914 | 13.69 | 
| Mar 1, 1914 | 13.81 | 
| Feb 1, 1914 | 13.86 | 
| Jan 1, 1914 | 13.48 | 
| Dec 1, 1913 | 12.76 | 
| Nov 1, 1913 | 12.66 | 
| Oct 1, 1913 | 12.87 | 
| Sep 1, 1913 | 13.17 | 
| Aug 1, 1913 | 12.93 | 
| Jul 1, 1913 | 12.48 | 
| Jun 1, 1913 | 12.21 | 
| May 1, 1913 | 12.75 | 
| Apr 1, 1913 | 12.99 | 
| Mar 1, 1913 | 12.89 | 
| Feb 1, 1913 | 13.03 | 
| Jan 1, 1913 | 13.40 | 
| Dec 1, 1912 | 13.40 | 
| Nov 1, 1912 | 14.09 | 
| Oct 1, 1912 | 14.43 | 
| Sep 1, 1912 | 14.66 | 
| Aug 1, 1912 | 14.79 | 
| Jul 1, 1912 | 14.66 | 
| Jun 1, 1912 | 14.85 | 
| May 1, 1912 | 15.07 | 
| Apr 1, 1912 | 15.30 | 
| Mar 1, 1912 | 15.06 | 
| Feb 1, 1912 | 14.86 | 
| Jan 1, 1912 | 15.22 | 
| Dec 1, 1911 | 15.44 | 
| Nov 1, 1911 | 15.07 | 
| Oct 1, 1911 | 14.22 | 
| Sep 1, 1911 | 13.87 | 
| Aug 1, 1911 | 14.40 | 
| Jul 1, 1911 | 14.85 | 
| Jun 1, 1911 | 14.65 | 
| May 1, 1911 | 14.11 | 
| Apr 1, 1911 | 13.58 | 
| Mar 1, 1911 | 13.41 | 
| Feb 1, 1911 | 13.34 | 
| Jan 1, 1911 | 12.91 | 
| Dec 1, 1910 | 12.40 | 
| Nov 1, 1910 | 12.71 | 
| Oct 1, 1910 | 12.68 | 
| Sep 1, 1910 | 12.08 | 
| Aug 1, 1910 | 11.96 | 
| Jul 1, 1910 | 11.64 | 
| Jun 1, 1910 | 12.21 | 
| May 1, 1910 | 12.79 | 
| Apr 1, 1910 | 12.96 | 
| Mar 1, 1910 | 13.24 | 
| Feb 1, 1910 | 12.87 | 
| Jan 1, 1910 | 13.31 | 
| Dec 1, 1909 | 13.55 | 
| Nov 1, 1909 | 13.66 | 
| Oct 1, 1909 | 14.01 | 
| Sep 1, 1909 | 14.25 | 
| Aug 1, 1909 | 14.54 | 
| Jul 1, 1909 | 14.51 | 
| Jun 1, 1909 | 14.63 | 
| May 1, 1909 | 14.70 | 
| Apr 1, 1909 | 14.56 | 
| Mar 1, 1909 | 14.27 | 
| Feb 1, 1909 | 14.43 | 
| Jan 1, 1909 | 15.23 | 
| Dec 1, 1908 | 15.57 | 
| Nov 1, 1908 | 15.05 | 
| Oct 1, 1908 | 13.94 | 
| Sep 1, 1908 | 13.62 | 
| Aug 1, 1908 | 13.61 | 
| Jul 1, 1908 | 12.91 | 
| Jun 1, 1908 | 12.32 | 
| May 1, 1908 | 12.17 | 
| Apr 1, 1908 | 11.43 | 
| Mar 1, 1908 | 10.73 | 
| Feb 1, 1908 | 10.21 | 
| Jan 1, 1908 | 10.49 | 
| Dec 1, 1907 | 9.95 | 
| Nov 1, 1907 | 9.35 | 
| Oct 1, 1907 | 9.81 | 
| Sep 1, 1907 | 10.88 | 
| Aug 1, 1907 | 10.86 | 
| Jul 1, 1907 | 11.60 | 
| Jun 1, 1907 | 11.04 | 
| May 1, 1907 | 11.28 | 
| Apr 1, 1907 | 11.55 | 
| Mar 1, 1907 | 11.36 | 
| Feb 1, 1907 | 12.46 | 
| Jan 1, 1907 | 12.72 | 
| Dec 1, 1906 | 12.95 | 
| Nov 1, 1906 | 13.20 | 
| Oct 1, 1906 | 13.06 | 
| Sep 1, 1906 | 13.60 | 
| Aug 1, 1906 | 13.33 | 
| Jul 1, 1906 | 12.54 | 
| Jun 1, 1906 | 13.01 | 
| May 1, 1906 | 12.98 | 
| Apr 1, 1906 | 13.47 | 
| Mar 1, 1906 | 13.81 | 
| Feb 1, 1906 | 14.31 | 
| Jan 1, 1906 | 14.57 | 
| Dec 1, 1905 | 14.24 | 
| Nov 1, 1905 | 14.21 | 
| Oct 1, 1905 | 14.62 | 
| Sep 1, 1905 | 14.77 | 
| Aug 1, 1905 | 15.08 | 
| Jul 1, 1905 | 14.91 | 
| Jun 1, 1905 | 14.83 | 
| May 1, 1905 | 15.04 | 
| Apr 1, 1905 | 16.25 | 
| Mar 1, 1905 | 16.92 | 
| Feb 1, 1905 | 16.92 | 
| Jan 1, 1905 | 16.69 | 
| Dec 1, 1904 | 16.84 | 
| Nov 1, 1904 | 16.56 | 
| Oct 1, 1904 | 15.60 | 
| Sep 1, 1904 | 14.64 | 
| Aug 1, 1904 | 13.93 | 
| Jul 1, 1904 | 13.38 | 
| Jun 1, 1904 | 12.76 | 
| May 1, 1904 | 12.66 | 
| Apr 1, 1904 | 12.85 | 
| Mar 1, 1904 | 12.46 | 
| Feb 1, 1904 | 12.42 | 
| Jan 1, 1904 | 12.68 | 
| Dec 1, 1903 | 12.40 | 
| Nov 1, 1903 | 11.67 | 
| Oct 1, 1903 | 11.45 | 
| Sep 1, 1903 | 11.66 | 
| Aug 1, 1903 | 11.77 | 
| Jul 1, 1903 | 11.98 | 
| Jun 1, 1903 | 12.38 | 
| May 1, 1903 | 12.92 | 
| Apr 1, 1903 | 12.99 | 
| Mar 1, 1903 | 13.36 | 
| Feb 1, 1903 | 13.71 | 
| Jan 1, 1903 | 13.61 | 
| Dec 1, 1902 | 12.78 | 
| Nov 1, 1902 | 13.31 | 
| Oct 1, 1902 | 14.09 | 
| Sep 1, 1902 | 14.81 | 
| Aug 1, 1902 | 15.05 | 
| Jul 1, 1902 | 14.94 | 
| Jun 1, 1902 | 14.88 | 
| May 1, 1902 | 15.27 | 
| Apr 1, 1902 | 15.61 | 
| Mar 1, 1902 | 15.40 | 
| Feb 1, 1902 | 15.70 | 
| Jan 1, 1902 | 15.90 | 
| Dec 1, 1901 | 15.90 | 
| Nov 1, 1901 | 16.22 | 
| Oct 1, 1901 | 15.93 | 
| Sep 1, 1901 | 16.16 | 
| Aug 1, 1901 | 16.30 | 
| Jul 1, 1901 | 16.13 | 
| Jun 1, 1901 | 17.35 | 
| May 1, 1901 | 15.83 | 
| Apr 1, 1901 | 16.72 | 
| Mar 1, 1901 | 15.48 | 
| Feb 1, 1901 | 15.00 | 
| Jan 1, 1901 | 14.68 | 
| Dec 1, 1900 | 14.31 | 
| Nov 1, 1900 | 13.50 | 
| Oct 1, 1900 | 12.52 | 
| Sep 1, 1900 | 12.08 | 
| Aug 1, 1900 | 12.38 | 
| Jul 1, 1900 | 12.21 | 
| Jun 1, 1900 | 12.21 | 
| May 1, 1900 | 12.58 | 
| Apr 1, 1900 | 13.21 | 
| Mar 1, 1900 | 13.04 | 
| Feb 1, 1900 | 12.94 | 
| Jan 1, 1900 | 12.71 | 
| Dec 1, 1899 | 12.54 | 
| Nov 1, 1899 | 13.77 | 
| Oct 1, 1899 | 13.83 | 
| Sep 1, 1899 | 14.23 | 
| Aug 1, 1899 | 14.75 | 
| Jul 1, 1899 | 14.75 | 
| Jun 1, 1899 | 14.63 | 
| May 1, 1899 | 15.36 | 
| Apr 1, 1899 | 16.48 | 
| Mar 1, 1899 | 16.73 | 
| Feb 1, 1899 | 16.98 | 
| Jan 1, 1899 | 16.85 | 
| Dec 1, 1898 | 16.14 | 
| Nov 1, 1898 | 15.34 | 
| Oct 1, 1898 | 15.00 | 
| Sep 1, 1898 | 15.47 | 
| Aug 1, 1898 | 15.65 | 
| Jul 1, 1898 | 15.24 | 
| Jun 1, 1898 | 15.33 | 
| May 1, 1898 | 14.91 | 
| Apr 1, 1898 | 14.14 | 
| Mar 1, 1898 | 14.53 | 
| Feb 1, 1898 | 15.38 | 
| Jan 1, 1898 | 15.58 | 
| Dec 1, 1897 | 15.32 | 
| Nov 1, 1897 | 15.41 | 
| Oct 1, 1897 | 16.43 | 
| Sep 1, 1897 | 17.47 | 
| Aug 1, 1897 | 17.17 | 
| Jul 1, 1897 | 16.62 | 
| Jun 1, 1897 | 16.42 | 
| May 1, 1897 | 16.21 | 
| Apr 1, 1897 | 16.69 | 
| Mar 1, 1897 | 17.83 | 
| Feb 1, 1897 | 18.44 | 
| Jan 1, 1897 | 19.33 | 
| Dec 1, 1896 | 20.10 | 
| Nov 1, 1896 | 20.53 | 
| Oct 1, 1896 | 18.92 | 
| Sep 1, 1896 | 18.23 | 
| Aug 1, 1896 | 17.06 | 
| Jul 1, 1896 | 17.82 | 
| Jun 1, 1896 | 18.78 | 
| May 1, 1896 | 18.86 | 
| Apr 1, 1896 | 18.67 | 
| Mar 1, 1896 | 18.25 | 
| Feb 1, 1896 | 18.29 | 
| Jan 1, 1896 | 17.31 | 
| Dec 1, 1895 | 17.28 | 
| Nov 1, 1895 | 18.93 | 
| Oct 1, 1895 | 20.21 | 
| Sep 1, 1895 | 21.19 | 
| Aug 1, 1895 | 21.77 | 
| Jul 1, 1895 | 22.21 | 
| Jun 1, 1895 | 22.93 | 
| May 1, 1895 | 23.34 | 
| Apr 1, 1895 | 23.00 | 
| Mar 1, 1895 | 22.96 | 
| Feb 1, 1895 | 23.94 | 
| Jan 1, 1895 | 25.37 | 
| Dec 1, 1894 | 26.88 | 
| Nov 1, 1894 | 25.79 | 
| Oct 1, 1894 | 24.56 | 
| Sep 1, 1894 | 24.22 | 
| Aug 1, 1894 | 22.81 | 
| Jul 1, 1894 | 21.07 | 
| Jun 1, 1894 | 20.67 | 
| May 1, 1894 | 20.16 | 
| Apr 1, 1894 | 20.16 | 
| Mar 1, 1894 | 19.19 | 
| Feb 1, 1894 | 18.00 | 
| Jan 1, 1894 | 17.16 | 
| Dec 1, 1893 | 16.96 | 
| Nov 1, 1893 | 16.98 | 
| Oct 1, 1893 | 16.17 | 
| Sep 1, 1893 | 15.20 | 
| Aug 1, 1893 | 13.75 | 
| Jul 1, 1893 | 13.67 | 
| Jun 1, 1893 | 14.63 | 
| May 1, 1893 | 14.93 | 
| Apr 1, 1893 | 15.93 | 
| Mar 1, 1893 | 15.50 | 
| Feb 1, 1893 | 15.67 | 
| Jan 1, 1893 | 15.55 | 
| Dec 1, 1892 | 14.89 | 
| Nov 1, 1892 | 15.16 | 
| Oct 1, 1892 | 15.32 | 
| Sep 1, 1892 | 15.12 | 
| Aug 1, 1892 | 15.61 | 
| Jul 1, 1892 | 15.50 | 
| Jun 1, 1892 | 15.61 | 
| May 1, 1892 | 15.80 | 
| Apr 1, 1892 | 15.91 | 
| Mar 1, 1892 | 16.06 | 
| Feb 1, 1892 | 16.00 | 
| Jan 1, 1892 | 16.09 | 
| Dec 1, 1891 | 15.91 | 
| Nov 1, 1891 | 15.63 | 
| Oct 1, 1891 | 16.07 | 
| Sep 1, 1891 | 16.27 | 
| Aug 1, 1891 | 15.25 | 
| Jul 1, 1891 | 14.94 | 
| Jun 1, 1891 | 15.40 | 
| May 1, 1891 | 15.93 | 
| Apr 1, 1891 | 16.20 | 
| Mar 1, 1891 | 15.90 | 
| Feb 1, 1891 | 16.43 | 
| Jan 1, 1891 | 16.45 | 
| Dec 1, 1890 | 15.86 | 
| Nov 1, 1890 | 16.20 | 
| Oct 1, 1890 | 17.42 | 
| Sep 1, 1890 | 18.19 | 
| Aug 1, 1890 | 18.45 | 
| Jul 1, 1890 | 18.83 | 
| Jun 1, 1890 | 18.92 | 
| May 1, 1890 | 19.00 | 
| Apr 1, 1890 | 18.17 | 
| Mar 1, 1890 | 17.75 | 
| Feb 1, 1890 | 17.83 | 
| Jan 1, 1890 | 17.98 | 
| Dec 1, 1889 | 17.73 | 
| Nov 1, 1889 | 18.03 | 
| Oct 1, 1889 | 18.41 | 
| Sep 1, 1889 | 18.97 | 
| Aug 1, 1889 | 18.73 | 
| Jul 1, 1889 | 18.71 | 
| Jun 1, 1889 | 19.32 | 
| May 1, 1889 | 19.23 | 
| Apr 1, 1889 | 18.95 | 
| Mar 1, 1889 | 19.22 | 
| Feb 1, 1889 | 19.87 | 
| Jan 1, 1889 | 19.90 | 
| Dec 1, 1888 | 19.77 | 
| Nov 1, 1888 | 19.53 | 
| Oct 1, 1888 | 19.34 | 
| Sep 1, 1888 | 18.88 | 
| Aug 1, 1888 | 17.90 | 
| Jul 1, 1888 | 17.04 | 
| Jun 1, 1888 | 16.16 | 
| May 1, 1888 | 16.24 | 
| Apr 1, 1888 | 15.61 | 
| Mar 1, 1888 | 15.16 | 
| Feb 1, 1888 | 15.38 | 
| Jan 1, 1888 | 15.10 | 
| Dec 1, 1887 | 14.64 | 
| Nov 1, 1887 | 14.83 | 
| Oct 1, 1887 | 14.65 | 
| Sep 1, 1887 | 15.26 | 
| Aug 1, 1887 | 15.57 | 
| Jul 1, 1887 | 16.09 | 
| Jun 1, 1887 | 16.61 | 
| May 1, 1887 | 17.23 | 
| Apr 1, 1887 | 17.06 | 
| Mar 1, 1887 | 16.80 | 
| Feb 1, 1887 | 16.54 | 
| Jan 1, 1887 | 16.78 | 
| Dec 1, 1886 | 17.09 | 
| Nov 1, 1886 | 17.82 | 
| Oct 1, 1886 | 17.66 | 
| Sep 1, 1886 | 17.49 | 
| Aug 1, 1886 | 17.32 | 
| Jul 1, 1886 | 17.48 | 
| Jun 1, 1886 | 17.50 | 
| May 1, 1886 | 17.02 | 
| Apr 1, 1886 | 17.66 | 
| Mar 1, 1886 | 18.21 | 
| Feb 1, 1886 | 18.93 | 
| Jan 1, 1886 | 18.91 | 
| Dec 1, 1885 | 19.26 | 
| Nov 1, 1885 | 19.17 | 
| Oct 1, 1885 | 17.78 | 
| Sep 1, 1885 | 16.61 | 
| Aug 1, 1885 | 16.63 | 
| Jul 1, 1885 | 15.56 | 
| Jun 1, 1885 | 14.83 | 
| May 1, 1885 | 14.73 | 
| Apr 1, 1885 | 14.73 | 
| Mar 1, 1885 | 14.60 | 
| Feb 1, 1885 | 14.41 | 
| Jan 1, 1885 | 13.82 | 
| Dec 1, 1884 | 14.00 | 
| Nov 1, 1884 | 13.70 | 
| Oct 1, 1884 | 13.66 | 
| Sep 1, 1884 | 13.80 | 
| Aug 1, 1884 | 13.94 | 
| Jul 1, 1884 | 12.83 | 
| Jun 1, 1884 | 12.56 | 
| May 1, 1884 | 12.83 | 
| Apr 1, 1884 | 13.68 | 
| Mar 1, 1884 | 14.04 | 
| Feb 1, 1884 | 13.82 | 
| Jan 1, 1884 | 13.20 | 
| Dec 1, 1883 | 13.35 | 
| Nov 1, 1883 | 13.57 | 
| Oct 1, 1883 | 13.28 | 
| Sep 1, 1883 | 13.57 | 
| Aug 1, 1883 | 13.34 | 
| Jul 1, 1883 | 13.89 | 
| Jun 1, 1883 | 14.02 | 
| May 1, 1883 | 13.82 | 
| Apr 1, 1883 | 13.98 | 
| Mar 1, 1883 | 13.61 | 
| Feb 1, 1883 | 13.36 | 
| Jan 1, 1883 | 13.59 | 
| Dec 1, 1882 | 13.58 | 
| Nov 1, 1882 | 13.49 | 
| Oct 1, 1882 | 14.06 | 
| Sep 1, 1882 | 14.43 | 
| Aug 1, 1882 | 14.26 | 
| Jul 1, 1882 | 13.82 | 
| Jun 1, 1882 | 13.06 | 
| May 1, 1882 | 13.10 | 
| Apr 1, 1882 | 13.24 | 
| Mar 1, 1882 | 13.21 | 
| Feb 1, 1882 | 13.21 | 
| Jan 1, 1882 | 13.48 | 
| Dec 1, 1881 | 13.66 | 
| Nov 1, 1881 | 13.94 | 
| Oct 1, 1881 | 13.72 | 
| Sep 1, 1881 | 13.81 | 
| Aug 1, 1881 | 13.58 | 
| Jul 1, 1881 | 13.78 | 
| Jun 1, 1881 | 14.15 | 
| May 1, 1881 | 13.85 | 
| Apr 1, 1881 | 13.14 | 
| Mar 1, 1881 | 13.07 | 
| Feb 1, 1881 | 12.81 | 
| Jan 1, 1881 | 12.74 | 
| Dec 1, 1880 | 11.92 | 
| Nov 1, 1880 | 11.67 | 
| Oct 1, 1880 | 11.30 | 
| Sep 1, 1880 | 11.20 | 
| Aug 1, 1880 | 11.45 | 
| Jul 1, 1880 | 11.28 | 
| Jun 1, 1880 | 11.01 | 
| May 1, 1880 | 11.20 | 
| Apr 1, 1880 | 12.43 | 
| Mar 1, 1880 | 13.01 | 
| Feb 1, 1880 | 13.06 | 
| Jan 1, 1880 | 13.13 | 
| Dec 1, 1879 | 12.95 | 
| Nov 1, 1879 | 13.17 | 
| Oct 1, 1879 | 12.71 | 
| Sep 1, 1879 | 11.64 | 
| Aug 1, 1879 | 11.41 | 
| Jul 1, 1879 | 11.52 | 
| Jun 1, 1879 | 11.48 | 
| May 1, 1879 | 11.62 | 
| Apr 1, 1879 | 11.31 | 
| Mar 1, 1879 | 11.15 | 
| Feb 1, 1879 | 11.53 | 
| Jan 1, 1879 | 11.34 | 
| Dec 1, 1878 | 11.13 | 
| Nov 1, 1878 | 11.22 | 
| Oct 1, 1878 | 11.29 | 
| Sep 1, 1878 | 11.45 | 
| Aug 1, 1878 | 11.25 | 
| Jul 1, 1878 | 11.38 | 
| Jun 1, 1878 | 11.18 | 
| May 1, 1878 | 10.98 | 
| Apr 1, 1878 | 10.98 | 
| Mar 1, 1878 | 10.71 | 
| Feb 1, 1878 | 10.54 | 
| Jan 1, 1878 | 10.80 | 
| Dec 1, 1877 | 10.83 | 
| Nov 1, 1877 | 10.93 | 
| Oct 1, 1877 | 11.16 | 
| Sep 1, 1877 | 10.98 | 
| Aug 1, 1877 | 10.40 | 
| Jul 1, 1877 | 9.77 | 
| Jun 1, 1877 | 9.41 | 
| May 1, 1877 | 10.20 | 
| Apr 1, 1877 | 10.25 | 
| Mar 1, 1877 | 11.12 | 
| Feb 1, 1877 | 11.79 | 
| Jan 1, 1877 | 12.60 | 
| Dec 1, 1876 | 12.79 | 
| Nov 1, 1876 | 12.56 | 
| Oct 1, 1876 | 12.51 | 
| Sep 1, 1876 | 12.30 | 
| Aug 1, 1876 | 12.81 | 
| Jul 1, 1876 | 13.09 | 
| Jun 1, 1876 | 12.97 | 
| May 1, 1876 | 12.79 | 
| Apr 1, 1876 | 13.02 | 
| Mar 1, 1876 | 13.26 | 
| Feb 1, 1876 | 13.04 | 
| Jan 1, 1876 | 12.62 | 
| Dec 1, 1875 | 12.14 | 
| Nov 1, 1875 | 11.87 | 
| Oct 1, 1875 | 11.41 | 
| Sep 1, 1875 | 11.35 | 
| Aug 1, 1875 | 11.21 | 
| Jul 1, 1875 | 10.93 | 
| Jun 1, 1875 | 10.68 | 
| May 1, 1875 | 10.69 | 
| Apr 1, 1875 | 10.90 | 
| Mar 1, 1875 | 10.55 | 
| Feb 1, 1875 | 10.22 | 
| Jan 1, 1875 | 10.05 | 
| Dec 1, 1874 | 9.87 | 
| Nov 1, 1874 | 9.93 | 
| Oct 1, 1874 | 9.85 | 
| Sep 1, 1874 | 9.87 | 
| Aug 1, 1874 | 9.72 | 
| Jul 1, 1874 | 9.70 | 
| Jun 1, 1874 | 9.70 | 
| May 1, 1874 | 9.74 | 
| Apr 1, 1874 | 10.00 | 
| Mar 1, 1874 | 10.28 | 
| Feb 1, 1874 | 10.43 | 
| Jan 1, 1874 | 10.13 | 
| Dec 1, 1873 | 9.61 | 
| Nov 1, 1873 | 8.83 | 
| Oct 1, 1873 | 9.21 | 
| Sep 1, 1873 | 10.14 | 
| Aug 1, 1873 | 11.04 | 
| Jul 1, 1873 | 11.11 | 
| Jun 1, 1873 | 11.19 | 
| May 1, 1873 | 11.41 | 
| Apr 1, 1873 | 11.45 | 
| Mar 1, 1873 | 11.68 | 
| Feb 1, 1873 | 11.84 | 
| Jan 1, 1873 | 11.82 | 
| Dec 1, 1872 | 11.79 | 
| Nov 1, 1872 | 11.58 | 
| Oct 1, 1872 | 11.69 | 
| Sep 1, 1872 | 11.72 | 
| Aug 1, 1872 | 12.00 | 
| Jul 1, 1872 | 12.22 | 
| Jun 1, 1872 | 12.36 | 
| May 1, 1872 | 12.56 | 
| Apr 1, 1872 | 12.63 | 
| Mar 1, 1872 | 12.37 | 
| Feb 1, 1872 | 12.05 | 
| Jan 1, 1872 | 12.07 | 
| Dec 1, 1871 | 11.85 | 
| Nov 1, 1871 | 11.60 | 
| Oct 1, 1871 | 11.48 | 
| Sep 1, 1871 | 12.10 | 
| Aug 1, 1871 | 11.98 | 
| Jul 1, 1871 | 11.82 | 
| Jun 1, 1871 | 12.05 | 
| May 1, 1871 | 12.15 | 
| Apr 1, 1871 | 11.85 | 
| Mar 1, 1871 | 11.52 | 
| Feb 1, 1871 | 11.25 | 
| Jan 1, 1871 | 11.10 | 
Price to earnings ratio, based on trailing twelve month “as reported” earnings.
Current PE is estimated from latest reported earnings and current market price.
    Source: 
    Robert Shiller and his book Irrational Exuberance for historic S&P 500 PE Ratio.