| Year | Value | | 2021 | 4,097.09 | | 2020 | 3,667.467 | | 2019 | 5,851.19 | | 2018 | 6,198.37 | | 2017 | 5,915.641 | | 2016 | 5,512.672996428 | | 2015 | 5,423.1731386274 | | 2014 | 5,974.825151208 | | 2013 | 6,031.574712 | | 2012 | 6,243.5428528513 | | 2011 | 6,280.2509832896 | | 2010 | 6,082.7394130742 | | 2009 | 6,615.125 | | 2008 | 6,283.831 | | 2007 | 6,154.451 | | 2006 | 6,215.321 | | 2005 | 5,998.434 | | 2004 | 5,698.49 | | 2003 | 5,159.695 | | 2002 | 4,940.527 | | 2001 | 4,548.547 | | 2000 | 5,160.872 | | 1999 | 4,925.2001953125 | | 1998 | 4,663.5 | | 1997 | 6,450.6000976563 | | 1996 | 7,618.1000976563 | | 1995 | 6,830.6000976563 | | 1994 | 6,405.2001953125 | | 1993 | 5,405 | | 1992 | 4,639.2001953125 | | 1991 | 4,023.3999023438 | | 1990 | 3,825.3999023438 | | 1989 | 3,447.1999511719 | | 1988 | 3,134.3000488281 | | 1987 | 2,862.5 | | 1986 | 2,547.3000488281 | | 1985 | 2,299.1000976563 | | 1984 | 2,193.3999023438 | | 1983 | 1,729.8000488281 | | 1982 | 1,511.4000244141 | | 1981 | 1,579 | | 1980 | 1,428.4000244141 | | 1979 | 1,263.9000244141 | | 1978 | 1,153.1999511719 | | 1977 | 984.0999755859 | | 1976 | 866.4000244141 | | 1975 | 797.700012207 | | 1974 | 847.299987793 | | 1973 | 843.9000244141 | | 1972 | 714.0999755859 | | 1971 | 564.9000244141 | | 1970 | 516.9000244141 |
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