Year | Value | 2021 | 39,362.293406138 | 2020 | 35,680.343627666 | 2019 | 37,096.783222919 | 2018 | 36,983.328727976 | 2017 | 35,042.865739398 | 2016 | 33,620.010787799 | 2015 | 33,199.111142334 | 2014 | 35,307.694506176 | 2013 | 34,626.45528897 | 2012 | 34,403.101352857 | 2011 | 34,412.408460416 | 2010 | 32,000.979325496 | 2009 | 30,426.075811711 | 2008 | 32,752.735669547 | 2007 | 31,507.334507582 | 2006 | 29,230.723714257 | 2005 | 27,761.73102723 | 2004 | 26,456.595524652 | 2003 | 23,845.45997424 | 2002 | 21,429.503508244 | 2001 | 20,724.78351317 | 2000 | 21,017.505743286 | 1999 | 20,764.319328013 | 1998 | 19,965.50702752 | 1997 | 19,886.046162327 | 1996 | 20,297.770422546 | 1995 | 20,205.369320908 | 1994 | 18,324.110745265 | 1993 | 17,111.934978548 | 1992 | 17,226.525753432 | 1991 | 16,185.745008626 | 1990 | 15,469.039470597 | 1989 | 13,958.827597368 | 1988 | 13,551.015064422 | 1987 | 12,046.114507679 | 1986 | 10,468.398314847 | 1985 | 8,651.3029811762 | 1984 | 8,295.4624723958 | 1983 | 7,951.0513223323 | 1982 | 7,784.2488166554 | 1981 | 7,854.5275292346 | 1980 | 7,787.240711046 | 1979 | 7,107.3084058098 | 1978 | 6,333.0887641821 | 1977 | 5,310.1851132576 | 1976 | 4,740.2750099994 | 1975 | 4,390.1777978012 | 1974 | 3,976.415394489 | 1973 | 3,636.0572406634 | 1972 | 3,038.7030089061 | 1971 | 2,646.616747995 | 1970 | 2,421.7265582442 |
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