| Year | Value | | 2021 | 4,603.9601184782 | | 2020 | 4,021.7740558814 | | 2019 | 4,237.5351569531 | | 2018 | 4,185.6264014874 | | 2017 | 4,047.8578734761 | | 2016 | 3,725.8434230073 | | 2015 | 3,730.5313223917 | | 2014 | 3,953.6147760774 | | 2013 | 3,850.0118039826 | | 2012 | 3,689.6032356359 | | 2011 | 3,477.8949740233 | | 2010 | 3,013.2579600189 | | 2009 | 2,537.0804297037 | | 2008 | 2,581.0953651207 | | 2007 | 2,228.0263681278 | | 2006 | 1,816.3587879936 | | 2005 | 1,543.947261134 | | 2004 | 1,327.9780648957 | | 2003 | 1,142.9811978314 | | 2002 | 1,031.5395987636 | | 2001 | 1,017.5483455414 | | 2000 | 1,021.3446992202 | | 1999 | 960.94398245992 | | 1998 | 999.16367787627 | | 1997 | 1,042.6645057146 | | 1996 | 996.48655203757 | | 1995 | 910.56622628698 | | 1994 | 816.85722186805 | | 1993 | 740.94707178782 | | 1992 | 693.17539142949 | | 1991 | 648.33328784795 | | 1990 | 633.54517997777 | | 1989 | 558.47567457319 | | 1988 | 533.18111287688 | | 1987 | 501.02767026191 | | 1986 | 504.69828314749 | | 1985 | 490.54648365922 | | 1984 | 483.2032768174 | | 1983 | 484.90808370074 | | 1982 | 514.17990098297 | | 1981 | 532.08809079171 | | 1980 | 466.7904285551 | | 1979 | 408.71313910121 | | 1978 | 363.86702526633 | | 1977 | 343.59049108674 | | 1976 | 314.29794015588 | | 1975 | 301.32614074052 | | 1974 | 279.4028305731 | | 1973 | 232.90651136875 | | 1972 | 188.61078613602 | | 1971 | 172.25526333464 | | 1970 | 163.07067434974 |
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