Year | Value | 2021 | 50,340 | 2020 | 32,519 | 2019 | 91,254 | 2018 | 80,154 | 2017 | 86,735 | 2016 | 80,085 | 2015 | 75,044 | 2014 | 72,345 | 2013 | 68,700 | 2012 | 61,161.300701909 | 2011 | 69,940.912476723 | 2010 | 75,306 | 2009 | 62,037 | 2008 | 61,298 | 2007 | 68,847 | 2006 | 55,239 | 2005 | 48,651 | 2004 | 41,526 | 2003 | 35,937 | 2002 | 37,160 | 2001 | 44,262 | 2000 | 44,542 | 1999 | 43,900 | 1998 | 40,100 | 1997 | 35,100 | 1996 | 32,000 | 1995 | 32,700 | 1994 | 34,500 | 1993 | 37,400 | 1992 | 25,800 | 1991 | 18,600 | 1990 | 27,100 | 1989 | 14,100 | 1988 | 13,600 | 1987 | 12,600 | 1986 | 12,200 | 1985 | 11,600 | 1984 | 13,700 | 1983 | 17,800 | 1982 | 8,700 | 1981 | 17,200 | 1980 | 14,800 | 1979 | 24,400 | 1978 | 25,000 | 1977 | 25,200 | 1976 | 24,500 | 1975 | 19,500 | 1974 | 17,200 | 1973 | 16,800 | 1972 | 12,800 | 1971 | 12,900 | 1970 | 10,100 |
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