| Year | Value | | 2014 | 3,965.9582334833 | | 2013 | 3,892.1137012713 | | 2012 | 3,923.0423244636 | | 2011 | 3,898.8231426713 | | 2010 | 3,876.4910840705 | | 2009 | 3,773.153806628 | | 2008 | 3,988.7676939304 | | 2007 | 3,976.5189771455 | | 2006 | 3,882.4906641301 | | 2005 | 3,771.3646139883 | | 2004 | 3,680.1684669441 | | 2003 | 3,637.2783317564 | | 2002 | 3,545.1707556783 | | 2001 | 3,426.7229024844 | | 2000 | 3,309.2837106285 | | 1999 | 3,321.4066283566 | | 1998 | 3,215.6796281523 | | 1997 | 3,188.3819675766 | | 1996 | 3,162.3748768092 | | 1995 | 3,066.5221539622 | | 1994 | 3,025.7107099196 | | 1993 | 2,995.9865886853 | | 1992 | 3,116.0128690917 | | 1991 | 3,223.918869416 | | 1990 | 3,426.5511006953 | | 1989 | 3,484.3521372783 | | 1988 | 3,426.2298439096 | | 1987 | 3,424.6572115536 | | 1986 | 3,268.3120105387 | | 1985 | 3,194.0949108122 | | 1984 | 3,103.8343771779 | | 1983 | 2,950.6627227205 | | 1982 | 2,833.4875370544 | | 1981 | 2,738.5564096877 | | 1980 | 2,697.7565935669 | | 1979 | 2,638.6957135885 | | 1978 | 2,611.1806074074 | | 1977 | 2,418.5692171632 | | 1976 | 2,284.2473640814 | | 1975 | 2,148.3749623477 | | 1974 | 2,070.1955964087 | | 1973 | 1,955.5111624699 | | 1972 | 1,827.7655532453 | | 1971 | 1,711.3032728989 | | 1970 | 1,588.618976176 | | 1969 | 1,467.3663909593 | | 1968 | 1,380.0950972692 | | 1967 | 1,306.3049130611 | | 1966 | 1,219.5130337973 | | 1965 | 1,135.0092407963 |
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