Year | Value | 2021 | 69,953.019233881 | 2020 | 53,949.802497178 | 2019 | 60,649.023132846 | 2018 | 66,488.263381531 | 2017 | 61,772.577708325 | 2016 | 58,475.323882667 | 2015 | 61,241.287334818 | 2014 | 78,188.048940639 | 2013 | 81,275.574702037 | 2012 | 79,207.141697666 | 2011 | 77,792.246286254 | 2010 | 69,298.769903014 | 2009 | 62,013.787648951 | 2008 | 72,925.956160079 | 2007 | 66,289.581049112 | 2006 | 57,640.681540847 | 2005 | 52,495.252731109 | 2004 | 44,745.836893918 | 2003 | 39,178.403238488 | 2002 | 33,279.788606557 | 2001 | 29,556.185274722 | 2000 | 27,940.509635681 | 1999 | 28,327.119879476 | 1998 | 27,906.675610469 | 1997 | 28,300.191757995 | 1996 | 28,212.573484628 | 1995 | 26,850.0741545 | 1994 | 22,345.281185136 | 1993 | 21,015.147319652 | 1992 | 23,144.743943345 | 1991 | 21,541.914139444 | 1990 | 20,580.534891788 | 1989 | 17,954.128981058 | 1988 | 18,515.220726911 | 1987 | 17,521.807916528 | 1986 | 14,973.045990107 | 1985 | 12,237.215885791 | 1984 | 11,506.387736748 | 1983 | 11,483.139250847 | 1982 | 11,904.337991398 | 1981 | 12,048.287675421 | 1980 | 12,006.794748599 | 1979 | 9,962.5922536424 | 1978 | 8,994.2097116826 | 1977 | 8,224.0451175225 | 1976 | 7,272.3046372201 | 1975 | 6,798.644497459 | 1974 | 5,678.3868947779 | 1973 | 4,797.5963501524 | 1972 | 3,707.4699111013 | 1971 | 3,144.5669753713 | 1970 | 2,758.5794574782 |
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