Year | Value | 2019 | 29,088.068525749 | 2018 | 30,044.669576114 | 2017 | 28,584.841780511 | 2016 | 25,428.771656915 | 2015 | 27,283.981373328 | 2014 | 38,684.197604344 | 2013 | 41,364.740890609 | 2012 | 43,067.865178587 | 2011 | 41,891.537515803 | 2010 | 35,309.755039472 | 2009 | 34,018.828290977 | 2008 | 49,280.925507691 | 2007 | 42,849.392813208 | 2006 | 41,077.778953576 | 2005 | 33,291.659742806 | 2004 | 25,738.515558297 | 2003 | 20,317.935309013 | 2002 | 16,965.502732102 | 2001 | 16,901.983093718 | 2000 | 19,640.396168395 | 1999 | 16,755.343241976 | 1998 | 15,444.021929742 | 1997 | 18,280.497646412 | 1996 | 18,830.042058672 | 1995 | 16,872.487286963 | 1994 | 14,697.539913073 | 1993 | 14,663.480870477 | 1992 | 14,162.268659158 | 1991 | 10,996.289404345 | 1990 | 14,454.356382199 | 1989 | 13,638.249443998 | 1988 | 12,083.118852112 | 1987 | 12,617.912129378 | 1986 | 12,108.55295481 | 1985 | 12,695.599136924 | 1984 | 13,410.62668876 | 1983 | 13,563.25656843 | 1982 | 15,603.436832554 | 1981 | 19,043.893808514 | 1980 | 18,845.724185911 | 1978 | 11,167.696413559 | 1977 | 10,567.883565736 | 1976 | 10,096.782711544 | 1975 | 9,730.9136972084 | 1974 | 8,264.9196661201 | 1973 | 2,912.9889788434 | 1972 | 2,475.299669904 | 1971 | 2,669.0243596502 | 1970 | 2,228.3684245859 |
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