Year | Value | 2021 | 18,219 | 2020 | 19,013 | 2019 | 79,436 | 2018 | 76,672 | 2017 | 71,293 | 2016 | 61,956 | 2015 | 56,544 | 2014 | 47,126 | 2013 | 46,816 | 2012 | 39,638 | 2011 | 35,560 | 2010 | 32,850 | 2009 | 25,542 | 2004 | 31,871 | 2003 | 27,751 | 2002 | 23,168 | 2001 | 23,213 | 2000 | 22,322 | 1999 | 22,200 | 1998 | 16,300 | 1997 | 17,500 | 1996 | 17,900 | 1995 | 15,700 | 1994 | 18,800 | 1993 | 16,200 | 1992 | 14,400 | 1991 | 11,400 | 1990 | 12,300 | 1989 | 11,400 | 1988 | 10,800 | 1987 | 10,200 | 1986 | 9,600 | 1985 | 10,500 | 1984 | 10,100 | 1983 | 9,500 | 1982 | 8,700 | 1981 | 10,000 | 1980 | 9,500 | 1979 | 8,300 | 1978 | 7,200 | 1977 | 6,300 | 1976 | 6,200 | 1975 | 5,400 | 1974 | 4,700 |
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