| Year | Value | | 2021 | 1,232.9482332004 | | 2020 | 1,100.9628339281 | | 2019 | 1,328.7081430912 | | 2018 | 1,507.8634533233 | | 2017 | 1,501.6375310788 | | 2016 | 1,207.2152147199 | | 2015 | 2,374.5319963953 | | 2014 | 3,490.9215231181 | | 2013 | 3,187.6017606306 | | 2012 | 2,864.0936188614 | | 2011 | 2,459.5154035982 | | 2010 | 1,869.1828156887 | | 2009 | 1,862.5677883238 | | 2008 | 1,509.0928211915 | | 2007 | 1,469.1353541835 | | 2006 | 1,367.0035328043 | | 2005 | 1,010.9782210553 | | 2004 | 772.38433926245 | | 2003 | 653.34998913243 | | 2002 | 547.35416829308 | | 2001 | 251.39803243623 | | 2000 | 198.96180542283 | | 1999 | 164.26280027805 | | 1998 | 252.98334398452 | | 1997 | 265.63061863798 | | 1996 | 208.47874722738 | | 1995 | 181.05148793696 | | 1994 | 15.484510047437 | | 1993 | 88.782403093775 | | 1992 | 75.219652933952 | | 1991 | 684.8665840277 | | 1990 | 562.54448413192 | | 1989 | 664.8984155962 | | 1988 | 458.60151933078 | | 1987 | 485.08398655908 | | 1986 | 559.87580881942 | | 1985 | 545.23436472004 |
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