| Year | Value | | 2021 | 5,783.07554266 | | 2020 | 5,262.002892836 | | 2019 | 6,283.6160115226 | | 2018 | 6,374.1877047939 | | 2017 | 6,056.9814885837 | | 2016 | 5,688.795698815 | | 2015 | 5,806.7599891007 | | 2014 | 5,994.1889820455 | | 2013 | 6,050.6974263983 | | 2012 | 5,194.2756503456 | | 2011 | 5,076.1298895452 | | 2010 | 5,132.9629579027 | | 2009 | 6,647.06 | | 2008 | 5,272.132 | | 2007 | 4,829.109 | | 2006 | 4,392.843 | | 2005 | 4,566.581 | | 2004 | 4,690.433 | | 2003 | 4,070.987 | | 2002 | 3,967.612 | | 2001 | 4,226.78 | | 2000 | 4,669.84 | | 1999 | 4,244.7000760586 | | 1998 | 4,739.0999917834 | | 1997 | 4,611.1999711544 | | 1996 | 3,556.7000812144 | | 1995 | 3,635.6000376792 | | 1994 | 3,645.699985847 | | 1993 | 3,267.4000590891 | | 1992 | 3,029.4000294951 | | 1991 | 2,701.3999441711 | | 1990 | 2,746.3000172822 | | 1989 | 2,622.4000050276 | | 1988 | 2,360.9999765605 | | 1987 | 2,423.2999933137 | | 1986 | 2,298.4000298156 | | 1985 | 2,102.1000283285 | | 1984 | 2,013.0000313448 | | 1983 | 1,716.5999800338 | | 1982 | 1,844.5000236556 | | 1981 | 1,721.0000198482 | | 1980 | 1,588.099996209 | | 1979 | 1,446.4000091553 | | 1978 | 1,442.799977675 | | 1977 | 1,308.2999828609 | | 1976 | 1,100.2000081688 | | 1975 | 988.0999981539 | | 1974 | 962.3000036254 | | 1973 | 791.800018862 | | 1972 | 687.4000032916 | | 1971 | 567.6000010373 | | 1970 | 519.6000018714 |
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