Year | Value | 2021 | 19,350 | 2020 | 11,696.8 | 2019 | 44,878 | 2018 | 40,014 | 2017 | 48,971 | 2016 | 46,405 | 2015 | 41,544 | 2014 | 50,239 | 2013 | 42,831 | 2012 | 40,081 | 2011 | 43,354 | 2010 | 41,600.554974515 | 2009 | 33,285 | 2008 | 36,786 | 2007 | 37,284 | 2006 | 36,170 | 2005 | 36,045 | 2004 | 33,517 | 2003 | 31,219 | 2002 | 32,605 | 2001 | 32,270 | 2000 | 24,297 | 1999 | 32,000 | 1998 | 36,900 | 1997 | 24,300 | 1996 | 20,800 | 1995 | 26,900 | 1994 | 18,300 | 1993 | 16,900 | 1992 | 15,100 | 1991 | 13,300 | 1990 | 12,500 | 1989 | 11,400 | 1988 | 10,800 | 1987 | 9,200 | 1986 | 8,400 | 1985 | 8,500 | 1984 | 12,400 | 1983 | 11,700 | 1982 | 12,600 | 1981 | 12,700 | 1980 | 13,800 | 1979 | 9,400 | 1978 | 9,300 | 1977 | 10,100 | 1976 | 12,000 | 1975 | 11,800 | 1974 | 12,300 | 1973 | 12,100 | 1972 | 11,600 | 1971 | 14,400 | 1970 | 14,400 |
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