| Year | Value | | 2021 | 10,114.523521392 | | 2020 | 8,311.2539572722 | | 2019 | 8,165.6328811969 | | 2018 | 7,752.8228979677 | | 2017 | 6,970.9555144899 | | 2016 | 6,238.0549366984 | | 2015 | 5,819.8776244347 | | 2014 | 6,643.0958853767 | | 2013 | 6,422.010444937 | | 2012 | 6,243.723978654 | | 2011 | 6,408.1626201324 | | 2010 | 5,620.2711044055 | | 2009 | 5,759.8028108266 | | 2008 | 5,971.7399879204 | | 2007 | 4,613.5218307182 | | 2006 | 3,734.941840054 | | 2005 | 3,338.7926535105 | | 2004 | 2,944.8211658645 | | 2003 | 2,371.1872791671 | | 2002 | 1,857.5053257054 | | 2001 | 1,546.2450254776 | | 2000 | 1,373.0151326004 | | 1999 | 1,439.8227979383 | | 1998 | 1,600.7160555262 | | 1997 | 1,231.0701941065 | | 1996 | 1,321.489314453 | | 1995 | 2,062.4361640419 | | 1994 | 1,001.3334209619 | | 1993 | 1,079.9213603372 | | 1992 | 1,029.5110503923 | | 1991 | 955.5230042655 | | 1990 | 1,831.4267798787 | | 1989 | 2,031.3107475762 | | 1988 | 2,092.5208665327 | | 1987 | 2,667.0560281917 | | 1986 | 1,933.1920948947 | | 1985 | 1,638.1781418814 | | 1984 | 1,685.6124940609 | | 1983 | 1,587.3589258424 | | 1982 | 1,848.2614358539 | | 1981 | 1,903.6810022694 | | 1980 | 1,895.4914954137 |
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