| Year | Value | | 2021 | 9,747.6526222454 | | 2020 | 8,769.6461841228 | | 2019 | 9,198.5828493148 | | 2018 | 9,175.1209042421 | | 2017 | 8,802.6671156927 | | 2016 | 8,356.9046915595 | | 2015 | 8,324.2673764718 | | 2014 | 8,893.0864004404 | | 2013 | 8,724.5999891628 | | 2012 | 8,604.43970757 | | 2011 | 8,477.2823476732 | | 2010 | 7,793.7958111054 | | 2009 | 7,184.720158689 | | 2008 | 7,637.6672767857 | | 2007 | 7,160.213922879 | | 2006 | 6,465.7940371373 | | 2005 | 6,019.77025698 | | 2004 | 5,648.3401554823 | | 2003 | 5,072.250543784 | | 2002 | 4,590.376169061 | | 2001 | 4,484.5481541355 | | 2000 | 4,565.5434142922 | | 1999 | 4,496.3408100518 | | 1998 | 4,407.2307616156 | | 1997 | 4,452.4857442696 | | 1996 | 4,518.6089120707 | | 1995 | 4,465.5930831355 | | 1994 | 4,068.6897651272 | | 1993 | 3,811.6463420287 | | 1992 | 3,823.7108812398 | | 1991 | 3,615.7394871317 | | 1990 | 3,490.3015810305 | | 1989 | 3,166.3548939438 | | 1988 | 3,096.7804890135 | | 1987 | 2,797.3586721455 | | 1986 | 2,508.6899405888 | | 1985 | 2,148.9073468291 | | 1984 | 2,087.2028159787 | | 1983 | 2,035.8735638081 | | 1982 | 2,039.7680924413 | | 1981 | 2,083.5817238921 | | 1980 | 2,034.7452558694 | | 1979 | 1,857.3034669316 | | 1978 | 1,667.8504027963 | | 1977 | 1,436.9025065768 | | 1976 | 1,296.8964299222 | | 1975 | 1,216.8237193058 | | 1974 | 1,114.2194747078 | | 1973 | 1,010.2942024168 | | 1972 | 847.00464686362 | | 1971 | 749.23763622803 | | 1970 | 694.09984272882 |
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