| Year | Value | | 2014 | 6,939.9435249093 | | 2013 | 7,367.441453432 | | 2012 | 7,363.1511809527 | | 2011 | 7,232.7081609763 | | 2010 | 7,734.3618751641 | | 2009 | 7,337.607019679 | | 2008 | 7,642.8910133406 | | 2007 | 7,512.9326778497 | | 2006 | 7,539.4799804445 | | 2005 | 7,651.7689680202 | | 2004 | 7,660.0972002401 | | 2003 | 7,528.0888228258 | | 2002 | 7,297.9534793401 | | 2001 | 7,341.0652576577 | | 2000 | 7,223.4734522774 | | 1999 | 7,148.3868451264 | | 1998 | 7,014.7437924044 | | 1997 | 6,832.5559883798 | | 1996 | 6,904.7680527249 | | 1995 | 6,621.7462383358 | | 1994 | 6,530.3686303766 | | 1993 | 6,453.0661657195 | | 1992 | 6,475.9281075259 | | 1991 | 6,359.9626056932 | | 1990 | 5,988.6603602282 | | 1989 | 5,878.0829965827 | | 1988 | 5,753.4843833809 | | 1987 | 5,665.1742748342 | | 1986 | 5,520.7937129484 | | 1985 | 5,267.4074644336 | | 1984 | 4,950.1115943451 | | 1983 | 4,713.2431081676 | | 1982 | 4,620.5248361469 | | 1981 | 4,585.4652839849 | | 1980 | 4,430.7276995655 | | 1979 | 4,216.564854441 | | 1978 | 3,947.6054439111 | | 1977 | 3,707.4258509297 | | 1976 | 3,611.4958452603 | | 1975 | 3,267.6459986127 | | 1974 | 3,276.0681640543 | | 1973 | 3,171.9583531089 | | 1972 | 2,938.2827821663 | | 1971 | 2,761.7013874158 | | 1970 | 2,638.7884521796 | | 1969 | 2,484.9099470765 | | 1968 | 2,283.6640165047 | | 1967 | 2,205.9835007788 | | 1966 | 2,117.2875362067 | | 1965 | 2,009.9322367442 | | 1964 | 1,916.2187743394 | | 1963 | 1,765.4307468619 | | 1962 | 1,662.0248678937 | | 1961 | 1,552.9781925951 | | 1960 | 1,461.824366842 |
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