Year | Value | 2021 | 45,710.890450597 | 2020 | 40,036.445821923 | 2019 | 42,130.89463661 | 2018 | 44,204.125502182 | 2017 | 42,069.085147269 | 2016 | 39,077.689317472 | 2015 | 44,512.596029184 | 2014 | 48,732.924925279 | 2013 | 53,871.554934019 | 2012 | 53,605.738715855 | 2011 | 48,363.135465754 | 2010 | 40,434.735696059 | 2009 | 33,482.731902588 | 2008 | 38,072.675189691 | 2007 | 31,382.239363974 | 2006 | 28,348.206637416 | 2005 | 26,918.77948181 | 2004 | 24,524.49803418 | 2003 | 18,933.248080154 | 2002 | 16,161.318353682 | 2001 | 15,632.687278881 | 2000 | 17,264.574828303 | 1999 | 16,493.576034341 | 1998 | 17,083.682848495 | 1997 | 18,756.052700856 | 1996 | 17,458.7387479 | 1995 | 16,118.046539004 | 1994 | 14,441.539445455 | 1993 | 13,945.398323154 | 1992 | 14,470.310040095 | 1991 | 14,632.708623359 | 1990 | 14,199.383859082 | 1989 | 14,164.74470355 | 1988 | 11,456.179241026 | 1987 | 9,257.534951424 | 1986 | 9,054.9644518017 | 1985 | 9,142.596002681 | 1984 | 10,074.815059686 | 1983 | 9,380.9341544233 | 1982 | 10,258.18127898 | 1981 | 9,728.4518011687 | 1980 | 8,172.9885455139 | 1979 | 7,428.2888319151 | 1978 | 6,735.9885489471 | 1977 | 6,336.9032797679 | 1976 | 6,205.3811800752 | 1975 | 5,800.8445724469 | 1974 | 5,350.4566703089 | 1973 | 3,961.9725580704 | 1972 | 3,265.2180370639 | 1971 | 2,843.5399957873 | 1970 | 2,692.518583939 |
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