Year | Value | 2021 | 34,751.132412294 | 2020 | 31,567.434809336 | 2019 | 32,874.844672269 | 2018 | 32,790.136119378 | 2017 | 31,246.179755545 | 2016 | 30,053.907959195 | 2015 | 29,775.888708812 | 2014 | 31,690.888714884 | 2013 | 31,126.938151266 | 2012 | 30,896.498692013 | 2011 | 30,951.329495783 | 2010 | 28,896.572279377 | 2009 | 27,429.643709655 | 2008 | 29,555.556421002 | 2007 | 28,507.037491509 | 2006 | 26,442.58129395 | 2005 | 25,155.695866513 | 2004 | 23,989.324593112 | 2003 | 21,652.281662664 | 2002 | 19,555.188302401 | 2001 | 18,932.724870111 | 2000 | 19,236.718146074 | 1999 | 18,968.45459137 | 1998 | 18,259.66370705 | 1997 | 18,113.223286054 | 1996 | 18,439.683737909 | 1995 | 18,348.551697041 | 1994 | 16,818.045424781 | 1993 | 15,773.396046423 | 1992 | 15,767.182774607 | 1991 | 14,815.043715555 | 1990 | 14,152.716627782 | 1989 | 12,742.466777319 | 1988 | 12,351.965605825 | 1987 | 10,974.142707401 | 1986 | 9,539.8362697313 | 1985 | 7,923.0574612807 | 1984 | 7,587.6596896573 | 1983 | 7,257.3206355751 | 1982 | 7,127.132055045 | 1981 | 7,276.8598348135 | 1980 | 7,206.3327465613 | 1979 | 6,604.3187267703 | 1978 | 5,858.9746221732 | 1977 | 4,915.329584407 | 1976 | 4,406.2360899932 | 1975 | 4,100.1361171661 | 1974 | 3,713.7763316754 | 1973 | 3,409.3886755029 | 1972 | 2,853.5571474081 | 1971 | 2,487.2000234172 | 1970 | 2,281.9371656759 |
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