| Year | Value | | 2014 | 6,021.5255465406 | | 2013 | 6,160.3605952074 | | 2012 | 6,247.7250542818 | | 2011 | 6,247.4555588876 | | 2010 | 6,350.1184051582 | | 2009 | 6,082.2725768381 | | 2008 | 6,409.0177472635 | | 2007 | 6,405.32274568 | | 2006 | 6,380.5152987246 | | 2005 | 6,295.1710881491 | | 2004 | 6,241.935402085 | | 2003 | 6,126.9766881163 | | 2002 | 5,996.1757876324 | | 2001 | 5,916.7341342542 | | 2000 | 5,780.0107375824 | | 1999 | 5,624.254450347 | | 1998 | 5,541.5984463861 | | 1997 | 5,448.6074021962 | | 1996 | 5,388.1650377796 | | 1995 | 5,256.0187762649 | | 1994 | 5,133.194246559 | | 1993 | 5,065.8732344269 | | 1992 | 5,110.1485719029 | | 1991 | 5,150.0963872155 | | 1990 | 5,135.8754581405 | | 1989 | 5,193.653174084 | | 1988 | 5,089.7383974561 | | 1987 | 4,968.009487183 | | 1986 | 4,809.5242803768 | | 1985 | 4,699.5895149793 | | 1984 | 4,517.4248050214 | | 1983 | 4,313.6850626782 | | 1982 | 4,187.3880309515 | | 1981 | 4,164.6023298868 | | 1980 | 4,133.9152999989 | | 1979 | 4,040.0535934909 | | 1978 | 3,875.4819978695 | | 1977 | 3,685.8368729317 | | 1976 | 3,584.254570105 | | 1975 | 3,310.4703501884 | | 1974 | 3,299.7237337812 | | 1973 | 3,186.1813832627 | | 1972 | 2,968.2057959267 | | 1971 | 2,764.8472968949 | | 1970 | 2,674.2164525067 | | 1969 | 2,313.1946811144 | | 1968 | 2,128.9633237693 | | 1967 | 1,975.6001653201 | | 1966 | 1,872.3619368057 | | 1965 | 1,757.8307441472 | | 1964 | 1,668.5492483789 | | 1963 | 1,541.1194360032 | | 1962 | 1,441.8377402417 | | 1961 | 1,341.2406498927 | | 1960 | 1,253.2990900142 |
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