Year | Value | 2021 | 23,090 | 2020 | 12,221 | 2019 | 49,276 | 2018 | 53,901 | 2017 | 50,330 | 2016 | 50,548 | 2015 | 49,020 | 2014 | 49,177 | 2013 | 46,644 | 2012 | 47,073.827458256 | 2011 | 47,195 | 2010 | 47,829 | 2009 | 47,856 | 2008 | 45,309 | 2007 | 47,038 | 2006 | 36,257 | 2005 | 34,104 | 2004 | 34,152 | 2003 | 46,334 | 2002 | 49,404 | 2001 | 47,648 | 2000 | 56,427 | 1999 | 51,600 | 1998 | 50,100 | 1997 | 51,400 | 1996 | 50,000 | 1995 | 48,000 | 1994 | 44,200 | 1993 | 41,900 | 1992 | 39,100 | 1991 | 29,900 | 1990 | 29,500 | 1989 | 29,600 | 1988 | 27,800 | 1987 | 21,800 | 1986 | 22,700 | 1985 | 22,500 | 1984 | 21,100 | 1983 | 18,500 | 1982 | 18,500 | 1981 | 19,200 | 1980 | 18,500 | 1979 | 18,900 | 1978 | 19,100 | 1977 | 10,100 | 1976 | 9,200 | 1975 | 8,400 | 1974 | 19,700 | 1973 | 20,000 | 1972 | 20,600 | 1971 | 19,800 | 1970 | 9,700 |
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