| Year | Value | | 2021 | 5,393.0145736371 | | 2020 | 5,441.4772259172 | | 2019 | 5,929.2734100136 | | 2018 | 5,459.5049219744 | | 2017 | 4,972.562721919 | | 2016 | 4,506.6206984631 | | 2015 | 4,349.3724786888 | | 2014 | 4,414.5775229891 | | 2013 | 4,545.1395995871 | | 2012 | 4,432.8848506457 | | 2011 | 4,297.9344774394 | | 2010 | 3,939.9855406897 | | 2009 | 3,291.4504258336 | | 2008 | 3,397.7707792659 | | 2007 | 3,157.4499302392 | | 2006 | 2,653.9197625822 | | 2005 | 2,254.5805981743 | | 2004 | 2,088.7372610646 | | 2003 | 1,847.1075816268 | | 2002 | 1,638.2022139646 | | 2001 | 1,458.4532450298 | | 2000 | 1,575.2217754589 | | 1999 | 1,596.369894132 | | 1998 | 1,415.4170700824 | | 1997 | 1,989.3347186953 | | 1996 | 2,550.3109426161 | | 1995 | 2,431.5018047989 | | 1994 | 2,152.8458555427 | | 1993 | 1,930.1739606957 | | 1992 | 1,696.8806985085 | | 1991 | 1,523.1704938698 | | 1990 | 1,344.5294434959 | | 1989 | 1,179.9373674193 | | 1988 | 1,019.7860906786 | | 1987 | 846.25221886664 | | 1986 | 730.38936423517 | | 1985 | 675.08671787143 | | 1984 | 748.88470538833 | | 1983 | 740.42587481208 | | 1982 | 686.50304542795 | | 1981 | 668.9699573667 | | 1980 | 640.51273701989 | | 1979 | 560.98902254499 | | 1978 | 505.79777115715 | | 1977 | 427.06170429284 | | 1976 | 375.01594668237 | | 1975 | 337.63647990968 | | 1974 | 319.95012720911 |
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