| Year | Value | | 2021 | 7,607.0549108567 | | 2020 | 6,953.4126744017 | | 2019 | 9,104.7118313313 | | 2018 | 9,099.1814851245 | | 2017 | 8,474.664102092 | | 2016 | 8,047.4524186767 | | 2015 | 7,542.1505433744 | | 2014 | 7,812.2581081391 | | 2013 | 7,376.7315360989 | | 2012 | 7,569.6786283249 | | 2011 | 7,754.1751777963 | | 2010 | 7,133.6768388003 | | 2009 | 7,093.8682217491 | | 2008 | 7,264.7609166529 | | 2007 | 6,844.5118115865 | | 2006 | 6,520.3067272321 | | 2005 | 5,964.7022726028 | | 2004 | 5,670.2555001775 | | 2003 | 5,352.1844043982 | | 2002 | 4,945.6229299367 | | 2001 | 4,896.2501496893 | | 2000 | 5,264.7166567268 | | 1999 | 4,969.7952944055 | | 1998 | 4,774.9560981797 | | 1997 | 4,451.859771458 | | 1996 | 4,441.6031942702 | | 1995 | 4,283.0947747053 | | 1994 | 4,060.5902342066 | | 1993 | 3,941.5541761023 | | 1992 | 3,971.3236138587 | | 1991 | 3,619.5166781439 | | 1990 | 3,466.2043515497 | | 1989 | 3,081.5568963663 | | 1988 | 2,742.3254963733 | | 1987 | 2,444.3749382334 | | 1986 | 2,242.890445556 | | 1985 | 1,892.319806925 | | 1984 | 1,708.8086313151 | | 1983 | 1,349.6587490255 | | 1982 | 1,271.3119407754 | | 1981 | 1,383.9949698686 | | 1980 | 1,246.4234088488 |
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