Year | Value | 2021 | 70,558 | 2020 | 42,395.999 | 2019 | 141,311 | 2018 | 141,025.363 | 2017 | 130,792 | 2016 | 129,880 | 2015 | 129,786 | 2014 | 117,800 | 2013 | 115,817.39635221 | 2012 | 106,167 | 2011 | 100,131 | 2010 | 84,408.115323682 | 2009 | 65,885 | 2008 | 67,840 | 2007 | 61,958 | 2006 | 56,072 | 2005 | 60,819 | 2004 | 46,917 | 2003 | 36,947 | 2002 | 37,482 | 2001 | 44,487 | 2000 | 29,387 | 1999 | 37,300 | 1998 | 44,800 | 1997 | 43,200 | 1996 | 35,200 | 1995 | 37,300 | 1994 | 30,600 | 1993 | 25,000 | 1992 | 21,200 | 1991 | 21,500 | 1990 | 22,100 | 1989 | 26,000 | 1988 | 33,600 | 1987 | 35,600 | 1986 | 32,100 | 1985 | 28,800 | 1984 | 29,900 | 1983 | 32,400 | 1982 | 32,200 | 1981 | 31,700 | 1980 | 32,100 | 1979 | 29,900 | 1978 | 30,300 | 1977 | 31,200 | 1976 | 30,900 | 1975 | 29,300 | 1974 | 28,900 | 1973 | 15,300 | 1972 | 15,300 | 1971 | 11,800 | 1970 | 16,500 |
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