Year | Value | 2021 | 40,488.281083514 | 2020 | 36,750.948224061 | 2019 | 38,074.887659551 | 2018 | 37,874.611197593 | 2017 | 35,941.03661441 | 2016 | 34,511.11895333 | 2015 | 34,030.93145467 | 2014 | 36,065.160496367 | 2013 | 35,395.077270832 | 2012 | 35,222.136069066 | 2011 | 35,243.648891763 | 2010 | 32,845.766075163 | 2009 | 31,273.535283026 | 2008 | 33,445.750014432 | 2007 | 32,326.183101108 | 2006 | 30,048.564913455 | 2005 | 28,585.447801378 | 2004 | 27,327.118707797 | 2003 | 24,639.724008339 | 2002 | 22,121.255484744 | 2001 | 21,358.763580647 | 2000 | 21,649.451771211 | 1999 | 21,393.527657399 | 1998 | 20,528.567841581 | 1997 | 20,423.694337572 | 1996 | 20,853.23404533 | 1995 | 20,789.468010822 | 1994 | 18,853.819598542 | 1993 | 17,590.234911592 | 1992 | 17,694.385754093 | 1991 | 16,622.293810893 | 1990 | 15,893.326414885 | 1989 | 14,326.0467309 | 1988 | 13,898.58513873 | 1987 | 12,336.890113303 | 1986 | 10,689.756276372 | 1985 | 8,783.7410238747 | 1984 | 8,395.7221873536 | 1983 | 8,013.0662111295 | 1982 | 7,801.0429522449 | 1981 | 7,849.8185758317 | 1980 | 7,808.8908752752 | 1979 | 7,167.384963617 | 1978 | 6,372.3414364018 | 1977 | 5,328.5069061681 | 1976 | 4,754.4273046637 | 1975 | 4,410.5367724239 | 1974 | 3,986.0944115084 | 1973 | 3,663.4033335559 | 1972 | 3,061.6128881368 | 1971 | 2,662.6380595813 | 1970 | 2,436.472116094 |
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