| Year | Value | | 2021 | 5,127.3092558066 | | 2020 | 4,605.7887731232 | | 2019 | 5,391.5341748623 | | 2018 | 5,630.5865869512 | | 2017 | 5,446.6077787377 | | 2016 | 5,070.853010094 | | 2015 | 5,260.8687759239 | | 2014 | 6,588.0617968573 | | 2013 | 6,548.4134503869 | | 2012 | 6,333.7165911447 | | 2011 | 5,701.3385997139 | | 2010 | 5,121.8884492524 | | 2009 | 4,280.9814670816 | | 2008 | 4,376.9872524074 | | 2007 | 3,853.6663374653 | | 2006 | 3,038.6058082713 | | 2005 | 2,797.2775489655 | | 2004 | 2,262.718671217 | | 2003 | 1,870.687818553 | | 2002 | 1,992.9134297132 | | 2001 | 2,036.0119906646 | | 2000 | 2,063.8624770273 | | 1999 | 1,839.6893236163 | | 1998 | 2,211.245362949 | | 1997 | 2,423.7098829462 | | 1996 | 2,244.3586639472 | | 1995 | 2,215.2501566611 | | 1994 | 2,012.8020239064 | | 1993 | 1,647.2173497874 | | 1992 | 1,451.411731663 | | 1991 | 1,225.9626678666 | | 1990 | 1,177.661052951 | | 1989 | 990.59824385929 | | 1988 | 1,041.38608155 | | 1987 | 962.23344087218 | | 1986 | 971.08773499686 | | 1985 | 981.11390167865 | | 1984 | 1,114.18814249 | | 1983 | 1,170.2114361015 | | 1982 | 1,231.6995588787 | | 1981 | 1,185.8149685588 | | 1980 | 1,119.1503299831 | | 1979 | 954.56824102246 | | 1978 | 819.39341463268 | | 1977 | 692.72900354666 | | 1976 | 544.5963900707 | | 1975 | 469.2647064578 |
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