| Year | Value | | 2021 | 3,611.5912358046 | | 2020 | 3,490.725902109 | | 2019 | 3,671.849396381 | | 2018 | 3,936.0460007531 | | 2017 | 3,957.8897913282 | | 2016 | 3,718.4799191523 | | 2015 | 3,614.4571782003 | | 2014 | 3,513.4826904907 | | 2013 | 3,306.8963767083 | | 2012 | 3,073.6871804811 | | 2011 | 3,005.0279778341 | | 2010 | 2,632.4071840291 | | 2009 | 1,908.7049691232 | | 2008 | 1,834.1940997407 | | 2007 | 1,494.4687383 | | 2006 | 1,315.9216457585 | | 2005 | 1,152.9671414815 | | 2004 | 989.18002411358 | | 2003 | 918.26572115315 | | 2002 | 806.94068083435 | | 2001 | 772.96117031034 | | 2000 | 799.55321569401 | | 1999 | 771.19397833023 | | 1998 | 784.81683338038 | | 1997 | 768.02506416166 | | 1996 | 708.99650878782 | | 1995 | 671.07894486729 | | 1994 | 613.99455167628 | | 1993 | 551.81072184609 | | 1992 | 523.23379325622 | | 1991 | 487.71525275343 | | 1990 | 443.87235329832 | | 1989 | 391.25339990958 | | 1988 | 396.35501381962 | | 1987 | 382.93313941161 | | 1986 | 372.84247857893 | | 1985 | 352.31376957984 | | 1984 | 351.96715854869 | | 1983 | 310.31854263894 | | 1982 | 293.4062953409 | | 1981 | 271.91534935425 | | 1980 | 253.89951158854 | | 1979 | 216.16444995227 | | 1978 | 157.54866604348 | | 1977 | 234.2427854589 | | 1976 | 206.63024235813 | | 1975 | 233.3616618225 | | 1974 | 229.73334977015 | | 1973 | 188.25466184687 | | 1972 | 171.89427367087 | | 1971 | 160.65162755042 |
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