| Year | Value | | 2021 | 7,181.4146394809 | | 2020 | 6,911.8987044887 | | 2019 | 7,175.2508857681 | | 2018 | 7,018.8538206374 | | 2017 | 6,676.2600279524 | | 2016 | 6,385.0039817285 | | 2015 | 6,076.510090289 | | 2014 | 5,680.1974119518 | | 2013 | 5,816.6464023164 | | 2012 | 5,506.7711043192 | | 2011 | 5,345.5378421984 | | 2010 | 5,539.7856524932 | | 2009 | 5,671.4027843929 | | 2008 | 5,857.1838595807 | | 2007 | 5,759.2459845882 | | 2006 | 5,192.1321092174 | | 2005 | 4,617.9856752575 | | 2004 | 4,364.7852756097 | | 2003 | 4,078.0792225155 | | 2002 | 3,952.3562968923 | | 2001 | 3,745.3508250984 | | 2000 | 3,465.0304933479 | | 1999 | 3,117.8067083626 | | 1998 | 3,031.3169726474 | | 1997 | 2,830.5320373246 | | 1996 | 2,729.9711108655 | | 1995 | 2,582.7415128013 | | 1994 | 2,363.5011495734 | | 1993 | 2,369.4817670796 | | 1992 | 2,311.2632254707 | | 1991 | 2,088.5602323767 | | 1990 | 1,966.0895661271 | | 1989 | 1,791.1868820758 | | 1988 | 1,637.4568377679 | | 1987 | 1,483.6259717498 | | 1986 | 1,322.4280773812 | | 1985 | 1,243.6035606226 | | 1984 | 1,158.8320820779 | | 1983 | 1,057.6925830079 | | 1982 | 982.42247198443 | | 1981 | 903.14669191589 | | 1980 | 729.14343423981 |
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