| Year | Value | | 2021 | 11,830.987182743 | | 2020 | 10,887.591089766 | | 2019 | 13,342.468707283 | | 2018 | 13,217.710030779 | | 2017 | 13,242.292985116 | | 2016 | 12,440.269050882 | | 2015 | 11,982.039220081 | | 2014 | 11,017.875257966 | | 2013 | 10,522.961193346 | | 2012 | 9,470.203419072 | | 2011 | 8,352.8838157518 | | 2010 | 7,015.4251940109 | | 2009 | 6,795.6615834493 | | 2008 | 6,339.8307898828 | | 2007 | 5,407.7326714414 | | 2006 | 4,605.2586190152 | | 2005 | 4,260.5200936602 | | 2004 | 3,973.0374685147 | | 2003 | 3,718.5172177336 | | 2002 | 3,742.4857825504 | | 2001 | 3,559.7651058691 | | 2000 | 3,584.1845713935 | | 1999 | 3,556.8450873469 | | 1998 | 3,533.450504212 | | 1997 | 3,338.3158871603 | | 1996 | 3,213.6228316114 | | 1995 | 3,075.0901673331 | | 1994 | 3,168.5706042825 | | 1993 | 3,004.069488472 | | 1992 | 2,788.5667762874 | | 1991 | 2,424.3468657092 | | 1990 | 2,318.2177441787 | | 1989 | 2,160.4958202541 | | 1988 | 2,277.4662354331 | | 1987 | 2,836.2948357648 | | 1986 | 2,583.524182835 | | 1985 | 2,670.6025976085 | | 1984 | 2,493.8923344032 | | 1983 | 2,546.7468303382 | | 1982 | 2,410.9419319151 | | 1981 | 2,136.5878472601 | | 1980 | 1,944.7453502405 | | 1979 | 1,822.9071431683 | | 1978 | 1,655.5978195879 | | 1977 | 1,423.154693 | | 1976 | 1,200.8730922686 | | 1975 | 1,184.9625449204 | | 1974 | 1,065.8630148212 | | 1973 | 961.35434170752 | | 1972 | 862.92986550037 | | 1971 | 808.6955531087 |
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