Date Value Value
Nov 1, 2016 323.64 million
Oct 1, 2016 323.41 million
Sep 1, 2016 323.18 million
Aug 1, 2016 322.93 million
Jul 1, 2016 322.69 million
Jun 1, 2016 322.48 million
May 1, 2016 322.26 million
Apr 1, 2016 322.07 million
Mar 1, 2016 321.89 million
Feb 1, 2016 321.72 million
Jan 1, 2016 321.57 million
Dec 1, 2015 321.37 million
Nov 1, 2015 321.16 million
Oct 1, 2015 320.94 million
Sep 1, 2015 320.71 million
Aug 1, 2015 320.46 million
Jul 1, 2015 320.22 million
Jun 1, 2015 320.01 million
May 1, 2015 319.78 million
Apr 1, 2015 319.59 million
Mar 1, 2015 319.40 million
Feb 1, 2015 319.23 million
Jan 1, 2015 319.07 million
Dec 1, 2014 318.86 million
Nov 1, 2014 318.66 million
Oct 1, 2014 318.43 million
Sep 1, 2014 318.18 million
Aug 1, 2014 317.93 million
Jul 1, 2014 317.68 million
Jun 1, 2014 317.46 million
May 1, 2014 317.25 million
Apr 1, 2014 317.05 million
Mar 1, 2014 316.87 million
Feb 1, 2014 316.70 million
Jan 1, 2014 316.54 million
Dec 1, 2013 316.33 million
Nov 1, 2013 316.13 million
Oct 1, 2013 315.90 million
Sep 1, 2013 315.66 million
Aug 1, 2013 315.42 million
Jul 1, 2013 315.18 million
Jun 1, 2013 314.98 million
May 1, 2013 314.78 million
Apr 1, 2013 314.61 million
Mar 1, 2013 314.44 million
Feb 1, 2013 314.28 million
Jan 1, 2013 314.14 million
Dec 1, 2012 313.96 million
Nov 1, 2012 313.77 million
Oct 1, 2012 313.55 million
Sep 1, 2012 313.32 million
Aug 1, 2012 313.09 million
Jul 1, 2012 312.86 million
Jun 1, 2012 312.66 million
May 1, 2012 312.46 million
Apr 1, 2012 312.29 million
Mar 1, 2012 312.11 million
Feb 1, 2012 311.93 million
Jan 1, 2012 311.77 million
Dec 1, 2011 311.57 million
Nov 1, 2011 311.38 million
Oct 1, 2011 311.19 million
Sep 1, 2011 310.95 million
Aug 1, 2011 310.72 million
Jul 1, 2011 310.50 million
Jun 1, 2011 310.29 million
May 1, 2011 310.10 million
Apr 1, 2011 309.91 million
Mar 1, 2011 309.73 million
Feb 1, 2011 309.57 million
Jan 1, 2011 309.42 million
Dec 1, 2010 309.22 million
Nov 1, 2010 309.02 million
Oct 1, 2010 308.82 million
Sep 1, 2010 308.57 million
Aug 1, 2010 308.34 million
Jul 1, 2010 308.11 million
Jun 1, 2010 307.91 million
May 1, 2010 307.72 million
Apr 1, 2010 307.53 million
Mar 1, 2010 308.57 million
Feb 1, 2010 308.38 million
Jan 1, 2010 308.17 million
Dec 1, 2009 307.95 million
Nov 1, 2009 307.76 million
Oct 1, 2009 307.52 million
Sep 1, 2009 307.27 million
Aug 1, 2009 307.01 million
Jul 1, 2009 306.77 million
Jun 1, 2009 306.54 million
May 1, 2009 306.32 million
Apr 1, 2009 306.11 million
Mar 1, 2009 305.92 million
Feb 1, 2009 305.71 million
Jan 1, 2009 305.52 million
Dec 1, 2008 305.30 million
Nov 1, 2008 305.09 million
Oct 1, 2008 304.86 million
Sep 1, 2008 304.61 million
Aug 1, 2008 304.36 million
Jul 1, 2008 304.09 million
Jun 1, 2008 303.85 million
May 1, 2008 303.62 million
Apr 1, 2008 303.38 million
Mar 1, 2008 303.19 million
Feb 1, 2008 302.97 million
Jan 1, 2008 302.75 million
Dec 1, 2007 302.53 million
Nov 1, 2007 302.29 million
Oct 1, 2007 302.03 million
Sep 1, 2007 301.77 million
Aug 1, 2007 301.50 million
Jul 1, 2007 301.23 million
Jun 1, 2007 300.97 million
May 1, 2007 300.73 million
Apr 1, 2007 300.51 million
Mar 1, 2007 300.29 million
Feb 1, 2007 300.10 million
Jan 1, 2007 299.89 million
Dec 1, 2006 299.66 million
Nov 1, 2006 299.40 million
Oct 1, 2006 299.16 million
Sep 1, 2006 298.91 million
Aug 1, 2006 298.63 million
Jul 1, 2006 298.38 million
Jun 1, 2006 298.12 million
May 1, 2006 297.87 million
Apr 1, 2006 297.65 million
Mar 1, 2006 297.42 million
Feb 1, 2006 297.22 million
Jan 1, 2006 296.99 million
Dec 1, 2005 296.76 million
Nov 1, 2005 296.51 million
Oct 1, 2005 296.31 million
Sep 1, 2005 296.04 million
Aug 1, 2005 295.77 million
Jul 1, 2005 295.52 million
Jun 1, 2005 295.26 million
May 1, 2005 295.03 million
Apr 1, 2005 294.78 million
Mar 1, 2005 294.56 million
Feb 1, 2005 294.38 million
Jan 1, 2005 294.23 million
Dec 1, 2004 294.02 million
Nov 1, 2004 293.80 million
Oct 1, 2004 293.57 million
Sep 1, 2004 293.31 million
Aug 1, 2004 293.06 million
Jul 1, 2004 292.81 million
Jun 1, 2004 292.57 million
May 1, 2004 292.35 million
Apr 1, 2004 292.11 million
Mar 1, 2004 291.89 million
Feb 1, 2004 291.72 million
Jan 1, 2004 291.55 million
Dec 1, 2003 291.36 million
Nov 1, 2003 291.16 million
Oct 1, 2003 290.92 million
Sep 1, 2003 290.66 million
Aug 1, 2003 290.39 million
Jul 1, 2003 290.11 million
Jun 1, 2003 289.82 million
May 1, 2003 289.55 million
Apr 1, 2003 289.40 million
Mar 1, 2003 289.26 million
Feb 1, 2003 289.13 million
Jan 1, 2003 289.00 million
Dec 1, 2002 288.80 million
Nov 1, 2002 288.61 million
Oct 1, 2002 288.38 million
Sep 1, 2002 288.13 million
Aug 1, 2002 287.87 million
Jul 1, 2002 287.63 million
Jun 1, 2002 287.39 million
May 1, 2002 287.15 million
Apr 1, 2002 286.93 million
Mar 1, 2002 286.72 million
Feb 1, 2002 286.54 million
Jan 1, 2002 286.34 million
Dec 1, 2001 286.14 million
Nov 1, 2001 285.92 million
Oct 1, 2001 285.69 million
Sep 1, 2001 285.49 million
Aug 1, 2001 285.22 million
Jul 1, 2001 284.97 million
Jun 1, 2001 284.73 million
May 1, 2001 284.49 million
Apr 1, 2001 284.27 million
Mar 1, 2001 284.05 million
Feb 1, 2001 283.84 million
Jan 1, 2001 283.65 million
Dec 1, 2000 283.44 million
Nov 1, 2000 283.20 million
Oct 1, 2000 282.96 million
Sep 1, 2000 282.69 million
Aug 1, 2000 282.42 million
Jul 1, 2000 282.16 million
Jun 1, 2000 281.89 million
May 1, 2000 281.64 million
Apr 1, 2000 281.42 million
Dec 1, 1999 280.47 million
Nov 1, 1999 280.22 million
Oct 1, 1999 279.95 million
Sep 1, 1999 279.65 million
Aug 1, 1999 279.35 million
Jul 1, 1999 279.04 million
Jun 1, 1999 278.75 million
May 1, 1999 278.46 million
Apr 1, 1999 278.20 million
Mar 1, 1999 277.94 million
Feb 1, 1999 277.74 million
Jan 1, 1999 277.53 million
Dec 1, 1998 277.27 million
Nov 1, 1998 277.02 million
Oct 1, 1998 276.75 million
Sep 1, 1998 276.45 million
Aug 1, 1998 276.16 million
Jul 1, 1998 275.85 million
Jun 1, 1998 275.57 million
May 1, 1998 275.30 million
Apr 1, 1998 275.04 million
Mar 1, 1998 274.78 million
Feb 1, 1998 274.58 million
Jan 1, 1998 274.37 million
Dec 1, 1997 274.11 million
Nov 1, 1997 273.87 million
Oct 1, 1997 273.59 million
Sep 1, 1997 273.29 million
Aug 1, 1997 272.97 million
Jul 1, 1997 272.65 million
Jun 1, 1997 272.36 million
May 1, 1997 272.08 million
Apr 1, 1997 271.82 million
Mar 1, 1997 271.56 million
Feb 1, 1997 271.32 million
Jan 1, 1997 271.09 million
Dec 1, 1996 270.86 million
Nov 1, 1996 270.61 million
Oct 1, 1996 270.31 million
Sep 1, 1996 270.02 million
Aug 1, 1996 269.70 million
Jul 1, 1996 269.39 million
Jun 1, 1996 269.11 million
May 1, 1996 268.84 million
Apr 1, 1996 268.58 million
Mar 1, 1996 268.32 million
Feb 1, 1996 268.09 million
Jan 1, 1996 267.88 million
Dec 1, 1995 267.67 million
Nov 1, 1995 267.44 million
Oct 1, 1995 267.18 million
Sep 1, 1995 266.88 million
Aug 1, 1995 266.57 million
Jul 1, 1995 266.28 million
Jun 1, 1995 265.99 million
May 1, 1995 265.72 million
Apr 1, 1995 265.47 million
Mar 1, 1995 265.21 million
Feb 1, 1995 264.98 million
Jan 1, 1995 264.75 million
Dec 1, 1994 264.51 million
Nov 1, 1994 264.26 million
Oct 1, 1994 264.00 million
Sep 1, 1994 263.72 million
Aug 1, 1994 263.42 million
Jul 1, 1994 263.13 million
Jun 1, 1994 262.84 million
May 1, 1994 262.57 million
Apr 1, 1994 262.32 million
Mar 1, 1994 262.04 million
Feb 1, 1994 261.81 million
Jan 1, 1994 261.60 million
Dec 1, 1993 261.35 million
Nov 1, 1993 261.10 million
Oct 1, 1993 260.84 million
Sep 1, 1993 260.54 million
Aug 1, 1993 260.23 million
Jul 1, 1993 259.92 million
Jun 1, 1993 259.62 million
May 1, 1993 259.34 million
Apr 1, 1993 259.07 million
Mar 1, 1993 258.81 million
Feb 1, 1993 258.57 million
Jan 1, 1993 258.33 million
Dec 1, 1992 258.06 million
Nov 1, 1992 257.80 million
Oct 1, 1992 257.50 million
Sep 1, 1992 257.19 million
Aug 1, 1992 256.86 million
Jul 1, 1992 256.51 million
Jun 1, 1992 256.20 million
May 1, 1992 255.89 million
Apr 1, 1992 255.59 million
Mar 1, 1992 255.29 million
Feb 1, 1992 255.03 million
Jan 1, 1992 254.78 million
Dec 1, 1991 254.53 million
Nov 1, 1991 254.27 million
Oct 1, 1991 253.97 million
Sep 1, 1991 253.65 million
Aug 1, 1991 253.31 million
Jul 1, 1991 252.98 million
Jun 1, 1991 252.68 million
May 1, 1991 252.29 million
Apr 1, 1991 251.96 million
Mar 1, 1991 251.68 million
Feb 1, 1991 251.45 million
Jan 1, 1991 251.21 million
Dec 1, 1990 251.00 million
Nov 1, 1990 250.77 million
Oct 1, 1990 250.53 million
Sep 1, 1990 250.23 million
Aug 1, 1990 249.92 million
Jul 1, 1990 249.62 million
Jun 1, 1990 249.34 million
May 1, 1990 249.05 million
Apr 1, 1990 248.79 million
Jul 1, 1989 246.82 million
Jul 1, 1988 244.50 million
Jul 1, 1987 242.29 million
Jul 1, 1986 240.13 million
Jul 1, 1985 237.92 million
Jul 1, 1984 235.82 million
Jul 1, 1983 233.79 million
Jul 1, 1982 231.66 million
Jul 1, 1981 229.47 million
Jul 1, 1980 227.22 million
Jul 1, 1979 225.06 million
Jul 1, 1978 222.58 million
Jul 1, 1977 220.24 million
Jul 1, 1976 218.04 million
Jul 1, 1975 215.97 million
Jul 1, 1974 213.85 million
Jul 1, 1973 211.91 million
Jul 1, 1972 209.90 million
Jul 1, 1971 207.66 million
Jul 1, 1970 205.05 million
Jul 1, 1969 202.68 million
Jul 1, 1968 200.71 million
Jul 1, 1967 198.71 million
Jul 1, 1966 196.56 million
Jul 1, 1965 194.30 million
Jul 1, 1964 191.89 million
Jul 1, 1963 189.24 million
Jul 1, 1962 186.54 million
Jul 1, 1961 183.69 million
Jul 1, 1960 180.67 million
Jul 1, 1959 177.83 million
Jul 1, 1958 174.88 million
Jul 1, 1957 171.98 million
Jul 1, 1956 168.90 million
Jul 1, 1955 165.93 million
Jul 1, 1954 163.03 million
Jul 1, 1953 160.18 million
Jul 1, 1952 157.55 million
Jul 1, 1951 154.88 million
Jul 1, 1950 152.27 million
Jul 1, 1949 149.19 million
Jul 1, 1948 146.63 million
Jul 1, 1947 144.13 million
Jul 1, 1946 141.39 million
Jul 1, 1945 139.93 million
Jul 1, 1944 138.40 million
Jul 1, 1943 136.74 million
Jul 1, 1942 134.86 million
Jul 1, 1941 133.40 million
Jul 1, 1940 132.12 million
Jul 1, 1939 130.88 million
Jul 1, 1938 129.82 million
Jul 1, 1937 128.82 million
Jul 1, 1936 128.05 million
Jul 1, 1935 127.25 million
Jul 1, 1934 126.37 million
Jul 1, 1933 125.58 million
Jul 1, 1932 124.84 million
Jul 1, 1931 124.04 million
Jul 1, 1930 123.08 million
Jul 1, 1929 121.77 million
Jul 1, 1928 120.51 million
Jul 1, 1927 119.04 million
Jul 1, 1926 117.40 million
Jul 1, 1925 115.83 million
Jul 1, 1924 114.11 million
Jul 1, 1923 111.95 million
Jul 1, 1922 110.05 million
Jul 1, 1921 108.54 million
Jul 1, 1920 106.46 million
Jul 1, 1919 104.51 million
Jul 1, 1918 103.21 million
Jul 1, 1917 103.27 million
Jul 1, 1916 101.96 million
Jul 1, 1915 100.55 million
Jul 1, 1914 99.11 million
Jul 1, 1913 97.23 million
Jul 1, 1912 95.34 million
Jul 1, 1911 93.86 million
Jul 1, 1910 92.41 million
Jul 1, 1909 90.49 million
Jul 1, 1908 88.71 million
Jul 1, 1907 87.01 million
Jul 1, 1906 85.45 million
Jul 1, 1905 83.82 million
Jul 1, 1904 82.17 million
Jul 1, 1903 80.63 million
Jul 1, 1902 79.16 million
Jul 1, 1901 77.58 million
Jul 1, 1900 76.09 million