Year | Value | 2021 | 29,681.557126188 | 2020 | 26,185.782588022 | 2019 | 28,011.165479752 | 2018 | 28,897.69628404 | 2017 | 26,867.811923159 | 2016 | 25,551.440404341 | 2015 | 24,535.584575022 | 2014 | 29,060.830985523 | 2013 | 28,943.544612913 | 2012 | 28,562.819183142 | 2011 | 31,676.031766315 | 2010 | 29,613.377768772 | 2009 | 30,714.242662182 | 2008 | 33,803.035307959 | 2007 | 31,836.304628393 | 2006 | 28,336.064833633 | 2005 | 27,062.45492607 | 2004 | 26,435.041630614 | 2003 | 23,190.740298983 | 2002 | 18,882.885640104 | 2001 | 17,394.327059257 | 2000 | 17,082.658818197 | 1999 | 18,736.895838317 | 1998 | 18,944.169174157 | 1997 | 18,550.154869034 | 1996 | 19,503.291861452 | 1995 | 17,379.766373965 | 1994 | 16,163.169557371 | 1993 | 15,682.438152307 | 1992 | 19,513.304067774 | 1991 | 18,534.252861693 | 1990 | 17,626.732428934 | 1989 | 13,971.523564752 | 1988 | 13,459.945850154 | 1987 | 12,141.092571807 | 1986 | 9,613.7573224507 | 1985 | 6,779.2261349547 | 1984 | 6,585.72654576 | 1983 | 6,657.5835695253 | 1982 | 6,405.680465131 | 1981 | 6,481.8171307589 | 1980 | 7,327.4149042245 | 1979 | 6,135.4821891542 | 1978 | 4,887.0729087909 | 1977 | 3,994.6102739629 | 1976 | 3,500.8791844871 | 1975 | 3,552.8402027839 | 1974 | 3,175.5549128983 | 1973 | 2,856.0069421665 | 1972 | 2,392.9819441331 | 1971 | 2,065.63141794 | 1970 | 1,885.3946418252 |
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