Year | Value | 2021 | 36,489.804086412 | 2020 | 31,922.266094284 | 2019 | 33,895.528771364 | 2018 | 34,960.740756657 | 2017 | 32,666.612561874 | 2016 | 31,203.694850269 | 2015 | 30,908.686330465 | 2014 | 36,234.531197758 | 2013 | 35,875.673833143 | 2012 | 34,392.293853626 | 2011 | 37,186.936054996 | 2010 | 34,395.099242765 | 2009 | 35,238.895463949 | 2008 | 38,687.988215138 | 2007 | 35,488.62577799 | 2006 | 31,189.037482493 | 2005 | 29,732.718719274 | 2004 | 28,879.468818799 | 2003 | 25,320.597597778 | 2002 | 20,726.809150431 | 2001 | 19,368.710870983 | 2000 | 19,327.587427846 | 1999 | 21,420.876848713 | 1998 | 21,519.760821283 | 1997 | 20,795.24626965 | 1996 | 22,934.389088514 | 1995 | 22,804.04776546 | 1994 | 19,869.258803803 | 1993 | 18,919.544228306 | 1992 | 20,150.053297605 | 1991 | 18,307.052069877 | 1990 | 18,610.732257936 | 1989 | 15,141.814028699 | 1988 | 15,174.195996805 | 1987 | 13,984.680453638 | 1986 | 11,576.678783052 | 1985 | 8,266.2204915295 | 1984 | 7,915.7534887102 | 1983 | 8,411.4939619414 | 1982 | 8,900.5934413911 | 1981 | 9,481.7030014955 | 1980 | 10,922.609224037 | 1979 | 9,659.5328778876 | 1978 | 8,010.1556357781 | 1977 | 6,462.4109076939 | 1976 | 5,912.8456258207 | 1975 | 5,767.3015426564 | 1974 | 4,615.9282554209 | 1973 | 4,340.6838449393 | 1972 | 3,376.2631514272 | 1971 | 2,789.1719273304 | 1970 | 2,521.8070230405 |
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