Year | Value | 2021 | 44,416.20019894 | 2020 | 40,405.343874 | 2019 | 39,659.405241172 | 2018 | 40,864.148368594 | 2017 | 37,839.342438946 | 2016 | 35,796.98257574 | 2015 | 35,093.91463971 | 2014 | 41,149.747879756 | 2013 | 40,439.567247994 | 2012 | 38,711.309785837 | 2011 | 41,789.955875173 | 2010 | 38,296.212701187 | 2009 | 38,788.560627718 | 2008 | 44,209.863425846 | 2007 | 40,174.256158746 | 2006 | 34,313.956944252 | 2005 | 32,328.401549713 | 2004 | 31,502.685400225 | 2003 | 27,056.452951434 | 2002 | 22,457.674907291 | 2001 | 20,702.817109293 | 2000 | 20,068.261909198 | 1999 | 21,508.946349111 | 1998 | 21,136.333603 | 1997 | 20,045.582869476 | 1996 | 20,573.835345883 | 1995 | 20,756.432139346 | 1994 | 15,458.384598248 | 1993 | 13,110.861053307 | 1992 | 16,722.815043862 | 1991 | 19,436.166382284 | 1990 | 22,301.994414852 | 1989 | 19,230.198381824 | 1988 | 17,981.033995683 | 1987 | 15,131.774494261 | 1986 | 12,247.004455639 | 1985 | 9,305.6181192164 | 1984 | 8,840.9729395628 | 1983 | 8,545.4067617492 | 1982 | 8,947.9280386837 | 1981 | 8,941.3412993793 | 1980 | 9,262.690468607 | 1979 | 7,740.970612949 | 1978 | 6,254.733547947 | 1977 | 5,796.1042658007 | 1976 | 5,605.9921767141 | 1975 | 5,229.7517612553 | 1974 | 4,481.9464228934 | 1973 | 3,559.9352172355 | 1972 | 2,722.306182318 | 1971 | 2,331.7772914143 | 1970 | 2,137.8932087524 |
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