| Date | S&P 500 PE Ratio |
|---|---|
| May 20, 2013 | 19.27 estimate |
| May 1, 2013 | 18.70 |
| Apr 1, 2013 | 18.16 |
| Mar 1, 2013 | 17.93 |
| Feb 1, 2013 | 17.48 |
| Jan 1, 2013 | 17.11 |
| 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 | 21.79 |
| Nov 1, 2009 | 28.51 |
| Oct 1, 2009 | 42.12 |
| Sep 1, 2009 | 83.30 |
| Aug 1, 2009 | 92.98 |
| Jul 1, 2009 | 101.83 |
| Jun 1, 2009 | 123.32 |
| May 1, 2009 | 123.79 |
| Apr 1, 2009 | 119.80 |
| Mar 1, 2009 | 110.37 |
| Feb 1, 2009 | 84.49 |
| Jan 1, 2009 | 70.89 |
| 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 | 25.80 |
| 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 | 17.79 |
| Jan 1, 2006 | 18.05 |
| Dec 1, 2005 | 18.05 |
| Nov 1, 2005 | 17.98 |
| Oct 1, 2005 | 17.61 |
| Sep 1, 2005 | 18.42 |
| Aug 1, 2005 | 18.69 |
| Jul 1, 2005 | 18.97 |
| Jun 1, 2005 | 18.97 |
| May 1, 2005 | 18.90 |
| Apr 1, 2005 | 18.99 |
| Mar 1, 2005 | 19.81 |
| Feb 1, 2005 | 20.08 |
| Jan 1, 2005 | 19.98 |
| 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 | 20.13 |
| Apr 1, 2004 | 21.23 |
| Mar 1, 2004 | 21.62 |
| 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 | 27.66 |
| 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 | 31.92 |
| Oct 1, 2002 | 29.05 |
| Sep 1, 2002 | 28.60 |
| Aug 1, 2002 | 31.32 |
| Jul 1, 2002 | 32.34 |
| Jun 1, 2002 | 37.92 |
| May 1, 2002 | 41.41 |
| Apr 1, 2002 | 43.81 |
| Mar 1, 2002 | 46.71 |
| Feb 1, 2002 | 44.56 |
| Jan 1, 2002 | 46.18 |
| Dec 1, 2001 | 46.37 |
| Nov 1, 2001 | 43.62 |
| Oct 1, 2001 | 39.73 |
| Sep 1, 2001 | 36.90 |
| Aug 1, 2001 | 37.85 |
| Jul 1, 2001 | 35.47 |
| 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 | 26.49 |
| Sep 1, 2000 | 27.34 |
| Aug 1, 2000 | 27.97 |
| Jul 1, 2000 | 28.05 |
| Jun 1, 2000 | 28.16 |
| May 1, 2000 | 27.50 |
| Apr 1, 2000 | 28.50 |
| Mar 1, 2000 | 28.31 |
| Feb 1, 2000 | 27.77 |
| 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 | 30.24 |
| 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 | 18.59 |
| 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 | 16.77 |
| 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 | 21.30 |
| Nov 1, 1993 | 21.64 |
| Oct 1, 1993 | 22.20 |
| 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 | 24.74 |
| Apr 1, 1992 | 24.72 |
| Mar 1, 1992 | 25.15 |
| Feb 1, 1992 | 25.59 |
| Jan 1, 1992 | 25.92 |
| Dec 1, 1991 | 24.33 |
| Nov 1, 1991 | 23.26 |
| Oct 1, 1991 | 22.49 |
| Sep 1, 1991 | 21.73 |
| Aug 1, 1991 | 21.24 |
| Jul 1, 1991 | 20.18 |
| Jun 1, 1991 | 19.55 |
| May 1, 1991 | 19.03 |
| Apr 1, 1991 | 18.65 |
| Mar 1, 1991 | 17.84 |
| Feb 1, 1991 | 17.23 |
| Jan 1, 1991 | 15.37 |
| Dec 1, 1990 | 15.41 |
| Nov 1, 1990 | 14.69 |
| 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 | 15.71 |
| Mar 1, 1990 | 15.62 |
| Feb 1, 1990 | 14.97 |
| Jan 1, 1990 | 15.12 |
| Dec 1, 1989 | 15.22 |
| Nov 1, 1989 | 14.69 |
| Oct 1, 1989 | 14.83 |
| 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 | 11.81 |
| 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 | 13.38 |
| Mar 1, 1988 | 14.29 |
| Feb 1, 1988 | 14.16 |
| Jan 1, 1988 | 14.03 |
| 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 | 19.73 |
| Apr 1, 1987 | 19.46 |
| Mar 1, 1987 | 19.37 |
| Feb 1, 1987 | 18.87 |
| Jan 1, 1987 | 18.01 |
| Dec 1, 1986 | 17.17 |
| Nov 1, 1986 | 16.79 |
| Oct 1, 1986 | 16.12 |
| Sep 1, 1986 | 16.05 |
| Aug 1, 1986 | 16.55 |
| Jul 1, 1986 | 16.27 |
| 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 | 12.40 |
| Sep 1, 1985 | 12.09 |
| Aug 1, 1985 | 12.26 |
| Jul 1, 1985 | 12.44 |
| 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 | 9.93 |
| 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 | 12.39 |
| Sep 1, 1983 | 12.57 |
| Aug 1, 1983 | 12.43 |
| Jul 1, 1983 | 13.02 |
| Jun 1, 1983 | 13.22 |
| May 1, 1983 | 13.10 |
| 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 | 10.66 |
| Oct 1, 1982 | 10.02 |
| 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 | 7.02 |
| Oct 1, 1979 | 7.10 |
| 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 | 9.52 |
| 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 | 11.50 |
| Mar 1, 1976 | 11.67 |
| Feb 1, 1976 | 11.93 |
| Jan 1, 1976 | 11.83 |
| Dec 1, 1975 | 11.14 |
| Nov 1, 1975 | 11.42 |
| Oct 1, 1975 | 11.31 |
| Sep 1, 1975 | 10.91 |
| Aug 1, 1975 | 10.95 |
| Jul 1, 1975 | 11.72 |
| Jun 1, 1975 | 11.61 |
| May 1, 1975 | 11.10 |
| Apr 1, 1975 | 10.22 |
| Mar 1, 1975 | 9.91 |
| Feb 1, 1975 | 9.31 |
| Jan 1, 1975 | 8.30 |
| Dec 1, 1974 | 7.54 |
| Nov 1, 1974 | 8.01 |
| 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 | 12.75 |
| Oct 1, 1973 | 13.99 |
| Sep 1, 1973 | 13.73 |
| Aug 1, 1973 | 13.77 |
| Jul 1, 1973 | 14.34 |
| Jun 1, 1973 | 14.50 |
| May 1, 1973 | 15.12 |
| Apr 1, 1973 | 15.89 |
| Mar 1, 1973 | 16.53 |
| Feb 1, 1973 | 17.12 |
| Jan 1, 1973 | 18.08 |
| Dec 1, 1972 | 18.30 |
| Nov 1, 1972 | 18.18 |
| Oct 1, 1972 | 17.59 |
| Sep 1, 1972 | 17.82 |
| Aug 1, 1972 | 18.26 |
| Jul 1, 1972 | 17.78 |
| Jun 1, 1972 | 18.09 |
| May 1, 1972 | 18.19 |
| Apr 1, 1972 | 18.57 |
| Mar 1, 1972 | 18.54 |
| Feb 1, 1972 | 18.23 |
| Jan 1, 1972 | 18.00 |
| Dec 1, 1971 | 17.40 |
| Nov 1, 1971 | 16.54 |
| Oct 1, 1971 | 17.63 |
| Sep 1, 1971 | 18.31 |
| Aug 1, 1971 | 18.04 |
| Jul 1, 1971 | 18.47 |
| Jun 1, 1971 | 18.74 |
| May 1, 1971 | 19.21 |
| Apr 1, 1971 | 19.62 |
| Mar 1, 1971 | 19.08 |
| Feb 1, 1971 | 18.71 |
| Jan 1, 1971 | 18.12 |
| Dec 1, 1970 | 17.55 |
| Nov 1, 1970 | 16.18 |
| Oct 1, 1970 | 15.98 |
| Sep 1, 1970 | 15.41 |
| Aug 1, 1970 | 14.40 |
| Jul 1, 1970 | 13.84 |
| Jun 1, 1970 | 13.69 |
| May 1, 1970 | 13.68 |
| Apr 1, 1970 | 15.38 |
| Mar 1, 1970 | 15.75 |
| Feb 1, 1970 | 15.35 |
| Jan 1, 1970 | 15.76 |
| Dec 1, 1969 | 15.76 |
| Nov 1, 1969 | 16.53 |
| Oct 1, 1969 | 16.33 |
| Sep 1, 1969 | 16.05 |
| Aug 1, 1969 | 16.04 |
| Jul 1, 1969 | 16.16 |
| Jun 1, 1969 | 16.98 |
| May 1, 1969 | 17.94 |
| Apr 1, 1969 | 17.38 |
| Mar 1, 1969 | 17.06 |
| Feb 1, 1969 | 17.50 |
| Jan 1, 1969 | 17.65 |
| Dec 1, 1968 | 18.49 |
| Nov 1, 1968 | 18.39 |
| Oct 1, 1968 | 18.24 |
| Sep 1, 1968 | 17.90 |
| Aug 1, 1968 | 17.43 |
| Jul 1, 1968 | 17.91 |
| Jun 1, 1968 | 18.04 |
| May 1, 1968 | 17.70 |
| Apr 1, 1968 | 17.46 |
| Mar 1, 1968 | 16.38 |
| Feb 1, 1968 | 16.81 |
| Jan 1, 1968 | 17.70 |
| 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 | 15.94 |
| Jan 1, 1967 | 15.30 |
| Dec 1, 1966 | 14.65 |
| Nov 1, 1966 | 14.62 |
| Oct 1, 1966 | 13.97 |
| Sep 1, 1966 | 14.12 |
| Aug 1, 1966 | 14.69 |
| Jul 1, 1966 | 15.66 |
| 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 | 17.54 |
| Jul 1, 1965 | 17.36 |
| Jun 1, 1965 | 17.57 |
| May 1, 1965 | 18.64 |
| Apr 1, 1965 | 18.60 |
| Mar 1, 1965 | 18.55 |
| Feb 1, 1965 | 18.70 |
| Jan 1, 1965 | 18.76 |
| Dec 1, 1964 | 18.45 |
| Nov 1, 1964 | 18.90 |
| Oct 1, 1964 | 18.86 |
| Sep 1, 1964 | 18.66 |
| Aug 1, 1964 | 18.55 |
| Jul 1, 1964 | 19.00 |
| Jun 1, 1964 | 18.53 |
| May 1, 1964 | 18.86 |
| Apr 1, 1964 | 18.90 |
| Mar 1, 1964 | 18.85 |
| Feb 1, 1964 | 18.74 |
| Jan 1, 1964 | 18.78 |
| 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 | 18.46 |
| Apr 1, 1963 | 18.34 |
| Mar 1, 1963 | 17.70 |
| Feb 1, 1963 | 17.82 |
| Jan 1, 1963 | 17.68 |
| Dec 1, 1962 | 17.07 |
| Nov 1, 1962 | 16.59 |
| Oct 1, 1962 | 15.69 |
| Sep 1, 1962 | 16.43 |
| Aug 1, 1962 | 16.67 |
| Jul 1, 1962 | 16.32 |
| Jun 1, 1962 | 16.03 |
| May 1, 1962 | 18.31 |
| Apr 1, 1962 | 20.01 |
| Mar 1, 1962 | 20.86 |
| Feb 1, 1962 | 21.21 |
| Jan 1, 1962 | 21.25 |
| Dec 1, 1961 | 22.49 |
| Nov 1, 1961 | 22.64 |
| Oct 1, 1961 | 21.94 |
| Sep 1, 1961 | 22.05 |
| Aug 1, 1961 | 22.30 |
| Jul 1, 1961 | 21.53 |
| 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 | 17.28 |
| Jul 1, 1960 | 17.13 |
| Jun 1, 1960 | 17.56 |
| May 1, 1960 | 16.73 |
| Apr 1, 1960 | 16.64 |
| Mar 1, 1960 | 16.23 |
| Feb 1, 1960 | 16.45 |
| Jan 1, 1960 | 17.12 |
| Dec 1, 1959 | 17.42 |
| Nov 1, 1959 | 16.83 |
| Oct 1, 1959 | 16.67 |
| Sep 1, 1959 | 16.63 |
| Aug 1, 1959 | 17.37 |
| Jul 1, 1959 | 17.52 |
| Jun 1, 1959 | 16.90 |
| May 1, 1959 | 17.56 |
| Apr 1, 1959 | 17.79 |
| Mar 1, 1959 | 18.06 |
| Feb 1, 1959 | 18.02 |
| Jan 1, 1959 | 18.79 |
| Dec 1, 1958 | 18.51 |
| Nov 1, 1958 | 18.17 |
| Oct 1, 1958 | 17.69 |
| Sep 1, 1958 | 17.00 |
| Aug 1, 1958 | 16.45 |
| Jul 1, 1958 | 15.80 |
| Jun 1, 1958 | 15.27 |
| May 1, 1958 | 14.57 |
| Apr 1, 1958 | 13.79 |
| Mar 1, 1958 | 13.41 |
| Feb 1, 1958 | 12.81 |
| Jan 1, 1958 | 12.50 |
| Dec 1, 1957 | 11.97 |
| Nov 1, 1957 | 11.87 |
| Oct 1, 1957 | 11.99 |
| Sep 1, 1957 | 12.67 |
| Aug 1, 1957 | 13.29 |
| Jul 1, 1957 | 14.10 |
| Jun 1, 1957 | 13.90 |
| May 1, 1957 | 13.72 |
| Apr 1, 1957 | 13.21 |
| Mar 1, 1957 | 12.95 |
| Feb 1, 1957 | 12.79 |
| Jan 1, 1957 | 13.32 |
| Dec 1, 1956 | 13.62 |
| Nov 1, 1956 | 13.34 |
| Oct 1, 1956 | 13.44 |
| Sep 1, 1956 | 13.54 |
| Aug 1, 1956 | 13.81 |
| Jul 1, 1956 | 13.74 |
| Jun 1, 1956 | 12.85 |
| May 1, 1956 | 12.82 |
| Apr 1, 1956 | 13.13 |
| Mar 1, 1956 | 12.87 |
| Feb 1, 1956 | 12.11 |
| Jan 1, 1956 | 12.13 |
| Dec 1, 1955 | 12.53 |
| Nov 1, 1955 | 12.63 |
| Oct 1, 1955 | 12.03 |
| Sep 1, 1955 | 12.89 |
| Aug 1, 1955 | 12.59 |
| Jul 1, 1955 | 12.98 |
| Jun 1, 1955 | 12.35 |
| May 1, 1955 | 12.01 |
| Apr 1, 1955 | 12.38 |
| Mar 1, 1955 | 12.33 |
| Feb 1, 1955 | 12.69 |
| Jan 1, 1955 | 12.58 |
| Dec 1, 1954 | 12.62 |
| Nov 1, 1954 | 12.29 |
| Oct 1, 1954 | 12.01 |
| Sep 1, 1954 | 11.96 |
| Aug 1, 1954 | 11.68 |
| Jul 1, 1954 | 11.50 |
| Jun 1, 1954 | 11.05 |
| May 1, 1954 | 11.05 |
| Apr 1, 1954 | 10.75 |
| Mar 1, 1954 | 10.42 |
| Feb 1, 1954 | 10.24 |
| Jan 1, 1954 | 10.10 |
| Dec 1, 1953 | 9.89 |
| Nov 1, 1953 | 9.72 |
| Oct 1, 1953 | 9.44 |
| Sep 1, 1953 | 9.13 |
| Aug 1, 1953 | 9.60 |
| Jul 1, 1953 | 9.64 |
| Jun 1, 1953 | 9.54 |
| May 1, 1953 | 10.02 |
| Apr 1, 1953 | 10.04 |
| Mar 1, 1953 | 10.70 |
| Feb 1, 1953 | 10.69 |
| Jan 1, 1953 | 10.86 |
| Dec 1, 1952 | 10.85 |
| Nov 1, 1952 | 10.47 |
| Oct 1, 1952 | 10.24 |
| Sep 1, 1952 | 10.50 |
| Aug 1, 1952 | 10.71 |
| Jul 1, 1952 | 10.67 |
| Jun 1, 1952 | 10.42 |
| May 1, 1952 | 10.06 |
| Apr 1, 1952 | 9.97 |
| Mar 1, 1952 | 9.92 |
| Feb 1, 1952 | 9.85 |
| Jan 1, 1952 | 9.95 |
| Dec 1, 1951 | 9.59 |
| Nov 1, 1951 | 9.23 |
| Oct 1, 1951 | 9.38 |
| Sep 1, 1951 | 9.35 |
| Aug 1, 1951 | 8.87 |
| Jul 1, 1951 | 8.28 |
| Jun 1, 1951 | 7.92 |
| May 1, 1951 | 7.95 |
| Apr 1, 1951 | 7.86 |
| Mar 1, 1951 | 7.64 |
| Feb 1, 1951 | 7.77 |
| Jan 1, 1951 | 7.47 |
| 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 | 7.44 |
| Apr 1, 1950 | 7.34 |
| Mar 1, 1950 | 7.32 |
| Feb 1, 1950 | 7.32 |
| Jan 1, 1950 | 7.21 |
| Dec 1, 1949 | 7.13 |
| Nov 1, 1949 | 6.88 |
| Oct 1, 1949 | 6.70 |
| Sep 1, 1949 | 6.48 |
| Aug 1, 1949 | 6.40 |
| Jul 1, 1949 | 6.15 |
| Jun 1, 1949 | 5.82 |
| May 1, 1949 | 6.18 |
| Apr 1, 1949 | 6.23 |
| Mar 1, 1949 | 6.26 |
| Feb 1, 1949 | 6.29 |
| Jan 1, 1949 | 6.62 |
| Dec 1, 1948 | 6.63 |
| Nov 1, 1948 | 6.89 |
| Oct 1, 1948 | 7.57 |
| 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 | 8.39 |
| Jan 1, 1948 | 9.04 |
| Dec 1, 1947 | 9.34 |
| Nov 1, 1947 | 9.60 |
| Oct 1, 1947 | 9.84 |
| Sep 1, 1947 | 9.72 |
| Aug 1, 1947 | 10.24 |
| Jul 1, 1947 | 10.66 |
| Jun 1, 1947 | 10.31 |
| May 1, 1947 | 10.39 |
| Apr 1, 1947 | 10.98 |
| Mar 1, 1947 | 11.94 |
| Feb 1, 1947 | 13.17 |
| Jan 1, 1947 | 13.46 |
| Dec 1, 1946 | 14.27 |
| Nov 1, 1946 | 14.69 |
| Oct 1, 1946 | 15.53 |
| Sep 1, 1946 | 16.96 |
| Aug 1, 1946 | 20.34 |
| Jul 1, 1946 | 20.99 |
| 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 | 14.98 |
| Jul 1, 1945 | 14.78 |
| Jun 1, 1945 | 15.09 |
| May 1, 1945 | 14.97 |
| Apr 1, 1945 | 14.72 |
| 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 | 14.08 |
| Jul 1, 1944 | 14.29 |
| Jun 1, 1944 | 13.77 |
| May 1, 1944 | 13.15 |
| Apr 1, 1944 | 12.78 |
| Mar 1, 1944 | 13.01 |
| Feb 1, 1944 | 12.66 |
| Jan 1, 1944 | 12.61 |
| Dec 1, 1943 | 12.21 |
| Nov 1, 1943 | 11.44 |
| Oct 1, 1943 | 11.53 |
| Sep 1, 1943 | 11.10 |
| Aug 1, 1943 | 10.77 |
| Jul 1, 1943 | 11.33 |
| Jun 1, 1943 | 11.00 |
| May 1, 1943 | 10.91 |
| Apr 1, 1943 | 10.59 |
| Mar 1, 1943 | 10.35 |
| Feb 1, 1943 | 10.08 |
| Jan 1, 1943 | 9.70 |
| Dec 1, 1942 | 9.24 |
| Nov 1, 1942 | 9.47 |
| Oct 1, 1942 | 9.61 |
| Sep 1, 1942 | 9.23 |
| Aug 1, 1942 | 9.04 |
| Jul 1, 1942 | 8.91 |
| 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 | 8.80 |
| Jul 1, 1941 | 9.16 |
| Jun 1, 1941 | 8.95 |
| May 1, 1941 | 8.73 |
| Apr 1, 1941 | 9.01 |
| Mar 1, 1941 | 9.39 |
| Feb 1, 1941 | 9.33 |
| Jan 1, 1941 | 10.05 |
| Dec 1, 1940 | 10.03 |
| Nov 1, 1940 | 10.36 |
| Oct 1, 1940 | 10.03 |
| Sep 1, 1940 | 9.84 |
| Aug 1, 1940 | 9.53 |
| Jul 1, 1940 | 9.51 |
| Jun 1, 1940 | 9.30 |
| May 1, 1940 | 10.37 |
| Apr 1, 1940 | 12.15 |
| 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 | 14.61 |
| Jul 1, 1939 | 15.01 |
| Jun 1, 1939 | 15.04 |
| May 1, 1939 | 15.18 |
| Apr 1, 1939 | 14.84 |
| Mar 1, 1939 | 17.45 |
| Feb 1, 1939 | 17.97 |
| Jan 1, 1939 | 18.94 |
| Dec 1, 1938 | 19.83 |
| Nov 1, 1938 | 20.75 |
| Oct 1, 1938 | 20.73 |
| Sep 1, 1938 | 18.95 |
| Aug 1, 1938 | 18.37 |
| Jul 1, 1938 | 17.00 |
| Jun 1, 1938 | 13.26 |
| May 1, 1938 | 11.88 |
| Apr 1, 1938 | 10.99 |
| Mar 1, 1938 | 10.63 |
| Feb 1, 1938 | 10.82 |
| Jan 1, 1938 | 10.47 |
| Dec 1, 1937 | 9.75 |
| Nov 1, 1937 | 9.66 |
| Oct 1, 1937 | 10.32 |
| Sep 1, 1937 | 11.78 |
| Aug 1, 1937 | 13.95 |
| Jul 1, 1937 | 13.92 |
| 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 | 17.54 |
| Oct 1, 1936 | 17.41 |
| 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 | 14.58 |
| Jul 1, 1935 | 13.48 |
| Jun 1, 1935 | 12.49 |
| May 1, 1935 | 12.50 |
| Apr 1, 1935 | 11.89 |
| Mar 1, 1935 | 11.52 |
| Feb 1, 1935 | 13.82 |
| Jan 1, 1935 | 16.25 |
| Dec 1, 1934 | 18.90 |
| Nov 1, 1934 | 18.78 |
| Oct 1, 1934 | 18.65 |
| Sep 1, 1934 | 18.50 |
| Aug 1, 1934 | 19.36 |
| Jul 1, 1934 | 20.15 |
| Jun 1, 1934 | 21.15 |
| May 1, 1934 | 21.33 |
| Apr 1, 1934 | 23.74 |
| Mar 1, 1934 | 23.87 |
| Feb 1, 1934 | 25.16 |
| Jan 1, 1934 | 23.95 |
| Dec 1, 1933 | 22.66 |
| Nov 1, 1933 | 22.23 |
| Oct 1, 1933 | 21.70 |
| Sep 1, 1933 | 24.60 |
| Aug 1, 1933 | 24.81 |
| Jul 1, 1933 | 26.12 |
| Jun 1, 1933 | 24.16 |
| May 1, 1933 | 21.12 |
| Apr 1, 1933 | 16.40 |
| Mar 1, 1933 | 14.83 |
| Feb 1, 1933 | 14.88 |
| Jan 1, 1933 | 17.29 |
| Dec 1, 1932 | 16.63 |
| Nov 1, 1932 | 16.40 |
| Oct 1, 1932 | 16.18 |
| Sep 1, 1932 | 17.96 |
| Aug 1, 1932 | 15.69 |
| Jul 1, 1932 | 10.22 |
| Jun 1, 1932 | 9.35 |
| May 1, 1932 | 10.40 |
| Apr 1, 1932 | 11.63 |
| Mar 1, 1932 | 14.75 |
| Feb 1, 1932 | 14.19 |
| Jan 1, 1932 | 14.07 |
| 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 | 16.29 |
| Oct 1, 1930 | 16.59 |
| Sep 1, 1930 | 18.39 |
| Aug 1, 1930 | 17.62 |
| Jul 1, 1930 | 16.98 |
| Jun 1, 1930 | 16.68 |
| May 1, 1930 | 17.87 |
| Apr 1, 1930 | 18.19 |
| Mar 1, 1930 | 16.51 |
| Feb 1, 1930 | 15.38 |
| Jan 1, 1930 | 13.92 |
| Dec 1, 1929 | 13.29 |
| Nov 1, 1929 | 12.94 |
| Oct 1, 1929 | 17.83 |
| Sep 1, 1929 | 20.19 |
| Aug 1, 1929 | 19.67 |
| Jul 1, 1929 | 18.86 |
| Jun 1, 1929 | 17.43 |
| May 1, 1929 | 17.34 |
| Apr 1, 1929 | 17.32 |
| Mar 1, 1929 | 17.66 |
| Feb 1, 1929 | 17.60 |
| Jan 1, 1929 | 17.76 |
| Dec 1, 1928 | 16.78 |
| Nov 1, 1928 | 16.96 |
| Oct 1, 1928 | 16.12 |
| Sep 1, 1928 | 16.16 |
| Aug 1, 1928 | 15.33 |
| Jul 1, 1928 | 15.09 |
| Jun 1, 1928 | 15.22 |
| May 1, 1928 | 16.39 |
| Apr 1, 1928 | 16.17 |
| Mar 1, 1928 | 15.47 |
| Feb 1, 1928 | 14.93 |
| Jan 1, 1928 | 15.51 |
| Dec 1, 1927 | 15.73 |
| Nov 1, 1927 | 15.23 |
| Oct 1, 1927 | 14.76 |
| Sep 1, 1927 | 14.86 |
| Aug 1, 1927 | 13.94 |
| Jul 1, 1927 | 13.12 |
| Jun 1, 1927 | 12.62 |
| May 1, 1927 | 12.35 |
| Apr 1, 1927 | 11.84 |
| Mar 1, 1927 | 11.46 |
| Feb 1, 1927 | 11.20 |
| Jan 1, 1927 | 10.89 |
| Dec 1, 1926 | 10.88 |
| Nov 1, 1926 | 10.64 |
| Oct 1, 1926 | 10.50 |
| Sep 1, 1926 | 10.74 |
| Aug 1, 1926 | 10.58 |
| Jul 1, 1926 | 10.18 |
| Jun 1, 1926 | 9.69 |
| May 1, 1926 | 9.25 |
| Apr 1, 1926 | 9.18 |
| Mar 1, 1926 | 9.45 |
| Feb 1, 1926 | 10.14 |
| Jan 1, 1926 | 10.12 |
| Dec 1, 1925 | 9.97 |
| Nov 1, 1925 | 10.05 |
| Oct 1, 1925 | 9.91 |
| Sep 1, 1925 | 9.84 |
| Aug 1, 1925 | 9.87 |
| Jul 1, 1925 | 9.91 |
| Jun 1, 1925 | 9.91 |
| May 1, 1925 | 10.01 |
| Apr 1, 1925 | 9.88 |
| Mar 1, 1925 | 10.29 |
| Feb 1, 1925 | 10.89 |
| Jan 1, 1925 | 11.02 |
| Dec 1, 1924 | 10.92 |
| Nov 1, 1924 | 10.37 |
| Oct 1, 1924 | 9.71 |
| Sep 1, 1924 | 9.84 |
| Aug 1, 1924 | 9.83 |
| Jul 1, 1924 | 9.51 |
| Jun 1, 1924 | 8.99 |
| May 1, 1924 | 8.82 |
| Apr 1, 1924 | 8.85 |
| Mar 1, 1924 | 8.97 |
| Feb 1, 1924 | 9.14 |
| Jan 1, 1924 | 9.01 |
| Dec 1, 1923 | 8.72 |
| Nov 1, 1923 | 8.61 |
| Oct 1, 1923 | 8.63 |
| Sep 1, 1923 | 8.96 |
| Aug 1, 1923 | 9.20 |
| Jul 1, 1923 | 9.37 |
| Jun 1, 1923 | 9.93 |
| May 1, 1923 | 10.70 |
| Apr 1, 1923 | 11.52 |
| Mar 1, 1923 | 12.41 |
| Feb 1, 1923 | 12.54 |
| Jan 1, 1923 | 12.54 |
| Dec 1, 1922 | 12.72 |
| Nov 1, 1922 | 13.33 |
| Oct 1, 1922 | 14.94 |
| Sep 1, 1922 | 15.36 |
| Aug 1, 1922 | 15.77 |
| Jul 1, 1922 | 16.37 |
| Jun 1, 1922 | 17.24 |
| May 1, 1922 | 18.54 |
| Apr 1, 1922 | 19.55 |
| Mar 1, 1922 | 19.85 |
| Feb 1, 1922 | 20.72 |
| Jan 1, 1922 | 22.81 |
| Dec 1, 1921 | 25.21 |
| Nov 1, 1921 | 21.39 |
| Oct 1, 1921 | 17.63 |
| Sep 1, 1921 | 15.74 |
| Aug 1, 1921 | 14.02 |
| Jul 1, 1921 | 13.06 |
| Jun 1, 1921 | 11.91 |
| May 1, 1921 | 12.07 |
| Apr 1, 1921 | 10.97 |
| Mar 1, 1921 | 10.27 |
| Feb 1, 1921 | 9.81 |
| Jan 1, 1921 | 9.36 |
| Dec 1, 1920 | 8.51 |
| Nov 1, 1920 | 9.23 |
| Oct 1, 1920 | 9.61 |
| Sep 1, 1920 | 9.48 |
| Aug 1, 1920 | 9.05 |
| Jul 1, 1920 | 9.31 |
| Jun 1, 1920 | 9.10 |
| May 1, 1920 | 9.16 |
| Apr 1, 1920 | 9.66 |
| Mar 1, 1920 | 9.63 |
| Feb 1, 1920 | 8.90 |
| Jan 1, 1920 | 9.60 |
| Dec 1, 1919 | 9.59 |
| Nov 1, 1919 | 9.78 |
| Oct 1, 1919 | 10.07 |
| Sep 1, 1919 | 9.48 |
| Aug 1, 1919 | 9.34 |
| Jul 1, 1919 | 9.91 |
| Jun 1, 1919 | 9.59 |
| May 1, 1919 | 9.25 |
| Apr 1, 1919 | 8.65 |
| Mar 1, 1919 | 8.29 |
| Feb 1, 1919 | 8.04 |
| Jan 1, 1919 | 7.93 |
| Dec 1, 1918 | 7.98 |
| Nov 1, 1918 | 7.98 |
| Oct 1, 1918 | 7.56 |
| Sep 1, 1918 | 7.11 |
| Aug 1, 1918 | 6.95 |
| Jul 1, 1918 | 6.77 |
| Jun 1, 1918 | 6.54 |
| May 1, 1918 | 6.41 |
| Apr 1, 1918 | 6.11 |
| Mar 1, 1918 | 6.02 |
| Feb 1, 1918 | 6.04 |
| Jan 1, 1918 | 5.72 |
| Dec 1, 1917 | 5.31 |
| Nov 1, 1917 | 5.42 |
| Oct 1, 1917 | 5.82 |
| Sep 1, 1917 | 6.06 |
| Aug 1, 1917 | 6.27 |
| Jul 1, 1917 | 6.37 |
| Jun 1, 1917 | 6.41 |
| May 1, 1917 | 6.20 |
| Apr 1, 1917 | 6.32 |
| Mar 1, 1917 | 6.33 |
| Feb 1, 1917 | 6.06 |
| Jan 1, 1917 | 6.34 |
| Dec 1, 1916 | 6.41 |
| Nov 1, 1916 | 6.90 |
| Oct 1, 1916 | 7.03 |
| Sep 1, 1916 | 7.07 |
| Aug 1, 1916 | 7.10 |
| Jul 1, 1916 | 7.33 |
| Jun 1, 1916 | 7.74 |
| May 1, 1916 | 8.06 |
| Apr 1, 1916 | 8.25 |
| Mar 1, 1916 | 8.82 |
| Feb 1, 1916 | 9.29 |
| Jan 1, 1916 | 10.03 |
| 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 | 14.49 |
| Oct 1, 1914 | 14.22 |
| Sep 1, 1914 | 13.96 |
| Aug 1, 1914 | 13.71 |
| Jul 1, 1914 | 13.47 |
| Jun 1, 1914 | 14.02 |
| May 1, 1914 | 14.09 |
| Apr 1, 1914 | 13.76 |
| Mar 1, 1914 | 13.87 |
| Feb 1, 1914 | 13.90 |
| Jan 1, 1914 | 13.50 |
| Dec 1, 1913 | 12.76 |
| Nov 1, 1913 | 12.58 |
| Oct 1, 1913 | 12.91 |
| Sep 1, 1913 | 13.12 |
| Aug 1, 1913 | 13.00 |
| Jul 1, 1913 | 12.47 |
| Jun 1, 1913 | 12.12 |
| May 1, 1913 | 12.76 |
| Apr 1, 1913 | 12.93 |
| Mar 1, 1913 | 12.94 |
| Feb 1, 1913 | 13.00 |
| Jan 1, 1913 | 13.48 |
| Dec 1, 1912 | 13.40 |
| Nov 1, 1912 | 14.10 |
| Oct 1, 1912 | 14.47 |
| Sep 1, 1912 | 14.72 |
| Aug 1, 1912 | 14.86 |
| Jul 1, 1912 | 14.75 |
| Jun 1, 1912 | 14.74 |
| May 1, 1912 | 14.97 |
| Apr 1, 1912 | 15.22 |
| Mar 1, 1912 | 15.00 |
| Feb 1, 1912 | 14.82 |
| Jan 1, 1912 | 15.20 |
| Dec 1, 1911 | 15.44 |
| Nov 1, 1911 | 15.12 |
| Oct 1, 1911 | 14.30 |
| Sep 1, 1911 | 13.76 |
| Aug 1, 1911 | 14.33 |
| Jul 1, 1911 | 14.82 |
| Jun 1, 1911 | 14.65 |
| May 1, 1911 | 14.15 |
| Apr 1, 1911 | 13.65 |
| Mar 1, 1911 | 13.31 |
| Feb 1, 1911 | 13.28 |
| Jan 1, 1911 | 12.88 |
| Dec 1, 1910 | 12.40 |
| Nov 1, 1910 | 12.75 |
| Oct 1, 1910 | 12.59 |
| Sep 1, 1910 | 12.04 |
| Aug 1, 1910 | 11.96 |
| Jul 1, 1910 | 11.68 |
| Jun 1, 1910 | 12.13 |
| May 1, 1910 | 12.75 |
| Apr 1, 1910 | 12.96 |
| Mar 1, 1910 | 13.28 |
| Feb 1, 1910 | 12.79 |
| Jan 1, 1910 | 13.26 |
| Dec 1, 1909 | 13.55 |
| Nov 1, 1909 | 13.57 |
| Oct 1, 1909 | 14.01 |
| Sep 1, 1909 | 14.15 |
| Aug 1, 1909 | 14.54 |
| Jul 1, 1909 | 14.41 |
| Jun 1, 1909 | 14.63 |
| May 1, 1909 | 14.59 |
| Apr 1, 1909 | 14.56 |
| Mar 1, 1909 | 14.16 |
| Feb 1, 1909 | 14.43 |
| Jan 1, 1909 | 15.10 |
| Dec 1, 1908 | 15.57 |
| Nov 1, 1908 | 14.97 |
| Oct 1, 1908 | 14.02 |
| Sep 1, 1908 | 13.62 |
| Aug 1, 1908 | 13.54 |
| Jul 1, 1908 | 12.98 |
| Jun 1, 1908 | 12.32 |
| May 1, 1908 | 12.11 |
| Apr 1, 1908 | 11.49 |
| Mar 1, 1908 | 10.73 |
| Feb 1, 1908 | 10.15 |
| Jan 1, 1908 | 10.54 |
| Dec 1, 1907 | 9.95 |
| Nov 1, 1907 | 9.33 |
| Oct 1, 1907 | 9.76 |
| Sep 1, 1907 | 10.80 |
| Aug 1, 1907 | 10.91 |
| Jul 1, 1907 | 11.63 |
| Jun 1, 1907 | 11.04 |
| May 1, 1907 | 11.25 |
| Apr 1, 1907 | 11.49 |
| Mar 1, 1907 | 11.28 |
| Feb 1, 1907 | 12.51 |
| Jan 1, 1907 | 12.75 |
| Dec 1, 1906 | 12.95 |
| Nov 1, 1906 | 13.24 |
| Oct 1, 1906 | 12.97 |
| Sep 1, 1906 | 13.55 |
| Aug 1, 1906 | 13.33 |
| Jul 1, 1906 | 12.58 |
| Jun 1, 1906 | 12.92 |
| May 1, 1906 | 12.93 |
| Apr 1, 1906 | 13.47 |
| Mar 1, 1906 | 13.86 |
| Feb 1, 1906 | 14.20 |
| Jan 1, 1906 | 14.51 |
| Dec 1, 1905 | 14.24 |
| Nov 1, 1905 | 14.11 |
| Oct 1, 1905 | 14.63 |
| Sep 1, 1905 | 14.65 |
| Aug 1, 1905 | 15.08 |
| Jul 1, 1905 | 14.78 |
| Jun 1, 1905 | 14.83 |
| May 1, 1905 | 14.91 |
| Apr 1, 1905 | 16.25 |
| Mar 1, 1905 | 16.76 |
| Feb 1, 1905 | 16.92 |
| Jan 1, 1905 | 16.53 |
| Dec 1, 1904 | 16.84 |
| Nov 1, 1904 | 16.67 |
| Oct 1, 1904 | 15.50 |
| Sep 1, 1904 | 14.64 |
| Aug 1, 1904 | 14.02 |
| Jul 1, 1904 | 13.29 |
| Jun 1, 1904 | 12.76 |
| May 1, 1904 | 12.75 |
| Apr 1, 1904 | 12.77 |
| Mar 1, 1904 | 12.46 |
| Feb 1, 1904 | 12.50 |
| Jan 1, 1904 | 12.60 |
| Dec 1, 1903 | 12.40 |
| Nov 1, 1903 | 11.63 |
| Oct 1, 1903 | 11.38 |
| Sep 1, 1903 | 11.55 |
| Aug 1, 1903 | 11.84 |
| Jul 1, 1903 | 12.02 |
| Jun 1, 1903 | 12.38 |
| May 1, 1903 | 12.88 |
| Apr 1, 1903 | 12.92 |
| Mar 1, 1903 | 13.25 |
| Feb 1, 1903 | 13.79 |
| Jan 1, 1903 | 13.65 |
| Dec 1, 1902 | 12.78 |
| Nov 1, 1902 | 13.29 |
| Oct 1, 1902 | 14.05 |
| Sep 1, 1902 | 14.75 |
| Aug 1, 1902 | 14.97 |
| Jul 1, 1902 | 14.83 |
| Jun 1, 1902 | 14.75 |
| May 1, 1902 | 15.38 |
| Apr 1, 1902 | 15.70 |
| Mar 1, 1902 | 15.47 |
| Feb 1, 1902 | 15.75 |
| Jan 1, 1902 | 15.92 |
| Dec 1, 1901 | 15.90 |
| Nov 1, 1901 | 16.16 |
| Oct 1, 1901 | 15.82 |
| Sep 1, 1901 | 16.00 |
| Aug 1, 1901 | 16.41 |
| Jul 1, 1901 | 16.18 |
| Jun 1, 1901 | 17.35 |
| May 1, 1901 | 15.78 |
| Apr 1, 1901 | 16.61 |
| Mar 1, 1901 | 15.33 |
| Feb 1, 1901 | 15.10 |
| Jan 1, 1901 | 14.73 |
| 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 | 13.74 |
| Oct 1, 1899 | 13.78 |
| Sep 1, 1899 | 14.16 |
| Aug 1, 1899 | 14.64 |
| Jul 1, 1899 | 14.60 |
| Jun 1, 1899 | 14.45 |
| May 1, 1899 | 15.53 |
| Apr 1, 1899 | 16.62 |
| Mar 1, 1899 | 16.84 |
| Feb 1, 1899 | 17.05 |
| Jan 1, 1899 | 16.89 |
| Dec 1, 1898 | 16.14 |
| Nov 1, 1898 | 15.20 |
| Oct 1, 1898 | 15.15 |
| Sep 1, 1898 | 15.47 |
| Aug 1, 1898 | 15.50 |
| Jul 1, 1898 | 15.39 |
| Jun 1, 1898 | 15.33 |
| May 1, 1898 | 14.76 |
| Apr 1, 1898 | 14.28 |
| Mar 1, 1898 | 14.53 |
| Feb 1, 1898 | 15.22 |
| Jan 1, 1898 | 15.74 |
| Dec 1, 1897 | 15.32 |
| Nov 1, 1897 | 15.50 |
| Oct 1, 1897 | 16.62 |
| Sep 1, 1897 | 17.17 |
| Aug 1, 1897 | 16.96 |
| Jul 1, 1897 | 16.52 |
| Jun 1, 1897 | 16.42 |
| May 1, 1897 | 16.32 |
| Apr 1, 1897 | 16.92 |
| Mar 1, 1897 | 17.46 |
| Feb 1, 1897 | 18.17 |
| Jan 1, 1897 | 19.18 |
| Dec 1, 1896 | 20.10 |
| Nov 1, 1896 | 20.86 |
| Oct 1, 1896 | 18.64 |
| Sep 1, 1896 | 18.23 |
| Aug 1, 1896 | 17.32 |
| Jul 1, 1896 | 17.57 |
| Jun 1, 1896 | 18.78 |
| May 1, 1896 | 19.13 |
| Apr 1, 1896 | 18.42 |
| Mar 1, 1896 | 18.25 |
| Feb 1, 1896 | 18.54 |
| Jan 1, 1896 | 17.08 |
| Dec 1, 1895 | 17.28 |
| Nov 1, 1895 | 19.13 |
| Oct 1, 1895 | 19.79 |
| Sep 1, 1895 | 20.96 |
| Aug 1, 1895 | 21.77 |
| Jul 1, 1895 | 22.48 |
| Jun 1, 1895 | 22.38 |
| May 1, 1895 | 23.05 |
| Apr 1, 1895 | 23.00 |
| Mar 1, 1895 | 23.28 |
| Feb 1, 1895 | 23.28 |
| Jan 1, 1895 | 25.00 |
| Dec 1, 1894 | 26.88 |
| Nov 1, 1894 | 25.53 |
| Oct 1, 1894 | 24.11 |
| Sep 1, 1894 | 23.58 |
| Aug 1, 1894 | 23.21 |
| Jul 1, 1894 | 21.25 |
| Jun 1, 1894 | 20.67 |
| May 1, 1894 | 20.00 |
| Apr 1, 1894 | 19.87 |
| Mar 1, 1894 | 18.79 |
| Feb 1, 1894 | 18.25 |
| Jan 1, 1894 | 17.28 |
| Dec 1, 1893 | 16.96 |
| Nov 1, 1893 | 16.93 |
| Oct 1, 1893 | 16.07 |
| Sep 1, 1893 | 15.07 |
| Aug 1, 1893 | 13.60 |
| Jul 1, 1893 | 13.48 |
| Jun 1, 1893 | 14.41 |
| May 1, 1893 | 15.13 |
| Apr 1, 1893 | 16.09 |
| Mar 1, 1893 | 15.62 |
| Feb 1, 1893 | 15.74 |
| Jan 1, 1893 | 15.58 |
| Dec 1, 1892 | 14.89 |
| Nov 1, 1892 | 15.05 |
| Oct 1, 1892 | 15.11 |
| Sep 1, 1892 | 15.22 |
| Aug 1, 1892 | 15.61 |
| Jul 1, 1892 | 15.39 |
| Jun 1, 1892 | 15.39 |
| May 1, 1892 | 15.91 |
| Apr 1, 1892 | 15.91 |
| Mar 1, 1892 | 15.94 |
| Feb 1, 1892 | 15.77 |
| Jan 1, 1892 | 16.21 |
| Dec 1, 1891 | 15.91 |
| Nov 1, 1891 | 15.44 |
| Oct 1, 1891 | 16.15 |
| Sep 1, 1891 | 16.15 |
| Aug 1, 1891 | 15.41 |
| Jul 1, 1891 | 14.91 |
| Jun 1, 1891 | 15.16 |
| May 1, 1891 | 15.97 |
| Apr 1, 1891 | 16.03 |
| Mar 1, 1891 | 16.03 |
| Feb 1, 1891 | 16.33 |
| Jan 1, 1891 | 16.69 |
| Dec 1, 1890 | 15.86 |
| Nov 1, 1890 | 16.24 |
| Oct 1, 1890 | 17.52 |
| Sep 1, 1890 | 18.34 |
| Aug 1, 1890 | 18.66 |
| Jul 1, 1890 | 19.10 |
| Jun 1, 1890 | 18.60 |
| May 1, 1890 | 18.73 |
| Apr 1, 1890 | 17.97 |
| Mar 1, 1890 | 17.60 |
| Feb 1, 1890 | 17.73 |
| Jan 1, 1890 | 17.93 |
| Dec 1, 1889 | 17.73 |
| Nov 1, 1889 | 17.83 |
| Oct 1, 1889 | 18.62 |
| Sep 1, 1889 | 18.97 |
| Aug 1, 1889 | 18.52 |
| Jul 1, 1889 | 18.93 |
| Jun 1, 1889 | 19.32 |
| May 1, 1889 | 19.00 |
| Apr 1, 1889 | 19.19 |
| Mar 1, 1889 | 19.22 |
| Feb 1, 1889 | 19.63 |
| Jan 1, 1889 | 20.15 |
| Dec 1, 1888 | 19.77 |
| Nov 1, 1888 | 19.41 |
| Oct 1, 1888 | 19.11 |
| Sep 1, 1888 | 18.55 |
| Aug 1, 1888 | 18.10 |
| Jul 1, 1888 | 17.13 |
| Jun 1, 1888 | 16.16 |
| May 1, 1888 | 16.16 |
| Apr 1, 1888 | 15.45 |
| Mar 1, 1888 | 14.94 |
| Feb 1, 1888 | 15.53 |
| Jan 1, 1888 | 15.17 |
| Dec 1, 1887 | 14.64 |
| Nov 1, 1887 | 14.72 |
| Oct 1, 1887 | 14.44 |
| Sep 1, 1887 | 15.37 |
| Aug 1, 1887 | 15.57 |
| Jul 1, 1887 | 15.97 |
| Jun 1, 1887 | 16.37 |
| May 1, 1887 | 17.35 |
| Apr 1, 1887 | 17.06 |
| Mar 1, 1887 | 16.68 |
| Feb 1, 1887 | 16.29 |
| Jan 1, 1887 | 16.91 |
| Dec 1, 1886 | 17.09 |
| Nov 1, 1886 | 17.55 |
| Oct 1, 1886 | 17.66 |
| Sep 1, 1886 | 17.22 |
| Aug 1, 1886 | 17.32 |
| Jul 1, 1886 | 17.19 |
| Jun 1, 1886 | 17.50 |
| May 1, 1886 | 16.73 |
| Apr 1, 1886 | 17.66 |
| Mar 1, 1886 | 17.90 |
| Feb 1, 1886 | 18.93 |
| Jan 1, 1886 | 18.57 |
| Dec 1, 1885 | 19.26 |
| Nov 1, 1885 | 19.41 |
| Oct 1, 1885 | 17.57 |
| Sep 1, 1885 | 16.61 |
| Aug 1, 1885 | 16.82 |
| Jul 1, 1885 | 15.38 |
| Jun 1, 1885 | 14.83 |
| May 1, 1885 | 14.90 |
| Apr 1, 1885 | 14.57 |
| Mar 1, 1885 | 14.60 |
| Feb 1, 1885 | 14.57 |
| Jan 1, 1885 | 13.68 |
| Dec 1, 1884 | 14.00 |
| Nov 1, 1884 | 13.59 |
| Oct 1, 1884 | 13.45 |
| Sep 1, 1884 | 13.91 |
| Aug 1, 1884 | 13.94 |
| Jul 1, 1884 | 12.74 |
| Jun 1, 1884 | 12.39 |
| May 1, 1884 | 12.92 |
| Apr 1, 1884 | 13.68 |
| Mar 1, 1884 | 13.95 |
| Feb 1, 1884 | 13.64 |
| Jan 1, 1884 | 13.28 |
| Dec 1, 1883 | 13.35 |
| Nov 1, 1883 | 13.65 |
| Oct 1, 1883 | 13.12 |
| Sep 1, 1883 | 13.49 |
| Aug 1, 1883 | 13.34 |
| Jul 1, 1883 | 13.98 |
| Jun 1, 1883 | 13.86 |
| May 1, 1883 | 13.74 |
| Apr 1, 1883 | 13.98 |
| Mar 1, 1883 | 13.69 |
| Feb 1, 1883 | 13.21 |
| Jan 1, 1883 | 13.51 |
| Dec 1, 1882 | 13.58 |
| Nov 1, 1882 | 13.51 |
| Oct 1, 1882 | 14.12 |
| Sep 1, 1882 | 14.51 |
| Aug 1, 1882 | 14.37 |
| Jul 1, 1882 | 13.95 |
| Jun 1, 1882 | 12.91 |
| May 1, 1882 | 12.98 |
| Apr 1, 1882 | 13.14 |
| Mar 1, 1882 | 13.14 |
| Feb 1, 1882 | 13.16 |
| Jan 1, 1882 | 13.45 |
| Dec 1, 1881 | 13.66 |
| Nov 1, 1881 | 14.07 |
| Oct 1, 1881 | 13.67 |
| Sep 1, 1881 | 13.89 |
| Aug 1, 1881 | 13.48 |
| Jul 1, 1881 | 13.80 |
| Jun 1, 1881 | 14.00 |
| May 1, 1881 | 13.83 |
| Apr 1, 1881 | 13.23 |
| Mar 1, 1881 | 13.00 |
| Feb 1, 1881 | 12.85 |
| Jan 1, 1881 | 12.63 |
| Dec 1, 1880 | 11.92 |
| Nov 1, 1880 | 11.69 |
| Oct 1, 1880 | 11.34 |
| Sep 1, 1880 | 11.26 |
| Aug 1, 1880 | 11.53 |
| Jul 1, 1880 | 11.39 |
| Jun 1, 1880 | 10.89 |
| May 1, 1880 | 11.09 |
| Apr 1, 1880 | 12.33 |
| Mar 1, 1880 | 12.93 |
| Feb 1, 1880 | 13.00 |
| Jan 1, 1880 | 13.10 |
| Dec 1, 1879 | 12.95 |
| Nov 1, 1879 | 13.32 |
| Oct 1, 1879 | 12.65 |
| Sep 1, 1879 | 11.72 |
| Aug 1, 1879 | 11.31 |
| Jul 1, 1879 | 11.54 |
| Jun 1, 1879 | 11.31 |
| May 1, 1879 | 11.59 |
| Apr 1, 1879 | 11.42 |
| Mar 1, 1879 | 11.06 |
| Feb 1, 1879 | 11.59 |
| Jan 1, 1879 | 11.19 |
| Dec 1, 1878 | 11.13 |
| Nov 1, 1878 | 11.19 |
| Oct 1, 1878 | 11.23 |
| Sep 1, 1878 | 11.35 |
| Aug 1, 1878 | 11.13 |
| Jul 1, 1878 | 11.23 |
| Jun 1, 1878 | 11.00 |
| May 1, 1878 | 11.13 |
| Apr 1, 1878 | 11.10 |
| Mar 1, 1878 | 10.80 |
| Feb 1, 1878 | 10.60 |
| Jan 1, 1878 | 10.83 |
| Dec 1, 1877 | 10.83 |
| Nov 1, 1877 | 10.87 |
| Oct 1, 1877 | 11.03 |
| Sep 1, 1877 | 10.80 |
| Aug 1, 1877 | 10.52 |
| Jul 1, 1877 | 9.83 |
| Jun 1, 1877 | 9.41 |
| May 1, 1877 | 10.14 |
| Apr 1, 1877 | 10.14 |
| Mar 1, 1877 | 10.93 |
| Feb 1, 1877 | 11.93 |
| Jan 1, 1877 | 12.68 |
| Dec 1, 1876 | 12.79 |
| Nov 1, 1876 | 12.41 |
| Oct 1, 1876 | 12.66 |
| Sep 1, 1876 | 12.30 |
| Aug 1, 1876 | 12.68 |
| Jul 1, 1876 | 13.23 |
| Jun 1, 1876 | 12.97 |
| May 1, 1876 | 12.67 |
| Apr 1, 1876 | 13.15 |
| Mar 1, 1876 | 13.26 |
| Feb 1, 1876 | 12.91 |
| Jan 1, 1876 | 12.74 |
| Dec 1, 1875 | 12.14 |
| Nov 1, 1875 | 11.81 |
| Oct 1, 1875 | 11.32 |
| Sep 1, 1875 | 11.21 |
| Aug 1, 1875 | 11.31 |
| Jul 1, 1875 | 10.98 |
| Jun 1, 1875 | 10.68 |
| May 1, 1875 | 10.64 |
| Apr 1, 1875 | 10.81 |
| Mar 1, 1875 | 10.43 |
| Feb 1, 1875 | 10.30 |
| Jan 1, 1875 | 10.09 |
| 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 | 8.78 |
| Oct 1, 1873 | 9.11 |
| Sep 1, 1873 | 10.20 |
| Aug 1, 1873 | 11.04 |
| Jul 1, 1873 | 11.04 |
| Jun 1, 1873 | 11.07 |
| May 1, 1873 | 11.48 |
| Apr 1, 1873 | 11.45 |
| Mar 1, 1873 | 11.61 |
| Feb 1, 1873 | 11.70 |
| Jan 1, 1873 | 11.88 |
| Dec 1, 1872 | 11.79 |
| Nov 1, 1872 | 11.51 |
| Oct 1, 1872 | 11.56 |
| Sep 1, 1872 | 11.79 |
| Aug 1, 1872 | 12.00 |
| Jul 1, 1872 | 12.14 |
| Jun 1, 1872 | 12.21 |
| May 1, 1872 | 12.63 |
| Apr 1, 1872 | 12.63 |
| Mar 1, 1872 | 12.29 |
| Feb 1, 1872 | 11.90 |
| Jan 1, 1872 | 12.15 |
| 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 | 11.83 |
| Jun 1, 1871 | 12.05 |
| May 1, 1871 | 12.15 |
| Apr 1, 1871 | 11.85 |
| Mar 1, 1871 | 11.53 |
| 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.