| Year | Value | | 2021 | 6,519.0003849343 | | 2020 | 6,070.6065663188 | | 2019 | 7,210.4287193989 | | 2018 | 6,739.6333411512 | | 2017 | 6,429.9304856428 | | 2016 | 6,856.6907565924 | | 2015 | 6,357.418964732 | | 2014 | 6,183.7008996903 | | 2013 | 5,808.571269913 | | 2012 | 5,756.768277236 | | 2011 | 5,913.7893749656 | | 2010 | 6,047.6987422343 | | 2009 | 6,006.7529671011 | | 2008 | 5,766.4430994784 | | 2007 | 5,299.2932916355 | | 2006 | 4,983.9121203723 | | 2005 | 4,478.0268679054 | | 2004 | 4,482.9624554064 | | 2003 | 4,283.0035377547 | | 2002 | 4,137.0032697134 | | 2001 | 4,296.1472798311 | | 2000 | 4,051.6607662469 | | 1999 | 4,192.2689137353 | | 1998 | 4,196.1763496839 | | 1997 | 3,925.7430806954 | | 1996 | 3,765.596105406 | | 1995 | 3,593.1744714885 | | 1994 | 3,474.6559676463 | | 1993 | 3,283.8028967769 | | 1992 | 3,110.6363308691 | | 1991 | 2,908.8565020811 | | 1990 | 2,700.4699037338 | | 1989 | 2,482.4382404629 | | 1988 | 2,319.4627881476 | | 1987 | 2,031.9055836639 | | 1986 | 1,789.4940399323 | | 1985 | 1,568.1005098057 | | 1984 | 1,429.2431474328 | | 1983 | 1,308.4172302371 | | 1982 | 1,188.5982180715 | | 1981 | 1,091.8089935689 | | 1980 | 965.68404599752 |
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