| Year | Value | | 2014 | 9,047.6855130076 | | 2013 | 8,385.6115864758 | | 2012 | 8,043.0755851516 | | 2011 | 7,514.4908393419 | | 2010 | 7,435.0444678416 | | 2009 | 6,990.5357070197 | | 2008 | 6,796.8655722729 | | 2007 | 6,622.8996076828 | | 2006 | 6,604.2965196607 | | 2005 | 6,457.3858033177 | | 2004 | 6,210.3453802009 | | 2003 | 6,306.3783368272 | | 2002 | 5,830.5963091779 | | 2001 | 5,709.427029309 | | 2000 | 5,432.6765329815 | | 1999 | 5,394.9468958565 | | 1998 | 5,287.2671641776 | | 1997 | 4,991.4293425187 | | 1996 | 4,871.1816625005 | | 1995 | 4,864.7199774978 | | 1994 | 4,794.6571797795 | | 1993 | 4,723.0092285524 | | 1992 | 4,397.8045696661 | | 1991 | 4,151.3062471164 | | 1990 | 4,075.2243566493 | | 1989 | 3,938.1948824179 | | 1988 | 3,847.7706004228 | | 1987 | 3,748.7407555453 | | 1986 | 3,478.4384799355 | | 1985 | 3,124.9212097986 | | 1984 | 3,079.2760667214 | | 1983 | 2,723.1351555676 | | 1982 | 2,604.9994491639 | | 1981 | 2,170.7756102591 | | 1980 | 1,878.0519696295 | | 1979 | 1,522.3091257366 | | 1978 | 1,044.8871534903 | | 1977 | 786.04544329502 | | 1976 | 681.8873507192 | | 1975 | 502.05481602888 | | 1974 | 473.57481907544 | | 1973 | 392.73452415783 | | 1972 | 340.40920487905 | | 1971 | 308.75497799007 |
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