| Year | Value | | 2021 | 34,622.189770017 | | 2020 | 28,287.816101074 | | 2019 | 32,670.094957927 | | 2018 | 33,037.804400622 | | 2017 | 31,578.239671577 | | 2016 | 28,790.088940416 | | 2015 | 26,768.909282391 | | 2014 | 25,436.740580202 | | 2013 | 23,109.888456351 | | 2012 | 20,569.353514596 | | 2011 | 18,088.195280607 | | 2010 | 16,736.95017104 | | 2009 | 15,602.689 | | 2008 | 14,140.434 | | 2007 | 11,267.296 | | 2006 | 9,974.92 | | 2005 | 8,894.202 | | 2004 | 8,257.37 | | 2003 | 6,876.218 | | 2002 | 5,951.593 | | 2001 | 4,960.746 | | 2000 | 4,994.165 | | 1999 | 4,789.3000190852 | | 1998 | 4,455.7000644804 | | 1997 | 4,382.9001052975 | | 1996 | 4,089.2000005843 | | 1995 | 4,049.2001246513 | | 1994 | 3,630.3999755978 | | 1993 | 3,103.4999673962 | | 1992 | 2,837.8000061512 | | 1991 | 2,484.5999876035 | | 1990 | 2,664.0999866501 | | 1989 | 2,794.5000072496 | | 1988 | 2,595.9000454546 | | 1987 | 2,313.0000341535 | | 1986 | 1,978.4000042078 | | 1985 | 2,059.1999868453 | | 1984 | 2,232.5999726353 | | 1983 | 2,029.0999744534 | | 1982 | 1,684.4000020624 | | 1981 | 1,529.4000137596 | | 1980 | 1,431.5999739912 | | 1979 | 1,403.10001681 | | 1978 | 1,195.5000009315 | | 1977 | 1,116.4000167847 | | 1976 | 1,016.6000064908 | | 1975 | 807.3999931366 | | 1974 | 703.1999927537 | | 1973 | 626.5000113025 | | 1972 | 463.8000042215 | | 1971 | 390.0000042692 | | 1970 | 300.4000076427 |
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