| Year | Value | | 2021 | 4,284.0218605502 | | 2020 | 4,551.7592887935 | | 2019 | 4,809.5049812258 | | 2018 | 4,503.7837235606 | | 2017 | 4,143.6480581343 | | 2016 | 3,649.4714278527 | | 2015 | 3,788.9951458422 | | 2014 | 3,796.4027825206 | | 2013 | 3,944.0543185421 | | 2012 | 4,115.8796123915 | | 2011 | 3,620.1364390859 | | 2010 | 3,225.1488097105 | | 2009 | 2,769.1941087046 | | 2008 | 3,017.2280072737 | | 2007 | 2,615.2788383925 | | 2006 | 2,580.0466240805 | | 2005 | 2,261.4094121457 | | 2004 | 2,032.7532768803 | | 2003 | 1,788.6933833368 | | 2002 | 1,650.1915859331 | | 2001 | 1,611.7975875853 | | 2000 | 1,851.1211661372 | | 1999 | 1,859.291772226 | | 1998 | 1,808.7557574186 | | 1997 | 2,023.8653613746 | | 1996 | 2,085.1756964019 | | 1995 | 1,945.6948648627 | | 1994 | 1,898.9408192598 | | 1993 | 1,304.3558229547 | | 1992 | 1,293.9121574839 | | 1991 | 1,259.3347292532 | | 1990 | 1,087.8685371152 | | 1989 | 1,038.1720235977 | | 1988 | 1,078.4038162455 | | 1987 | 807.67273273767 | | 1986 | 686.03020189218 | | 1985 | 597.15179367509 | | 1984 | 635.29977654165 | | 1983 | 599.38635082991 | | 1982 | 625.4306479708 | | 1981 | 632.38862255343 |
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