Year | Value | 2021 | 1,423 | 2020 | 1,118 | 2019 | 3,326 | 2018 | 5,456 | 2017 | 8,698 | 2016 | 2,994 | 2015 | 306 | 2014 | 9,000 | 2013 | 11,724 | 2012 | 13,296 | 2011 | 12,430 | 2010 | 15,318 | 2009 | 18,556 | 2008 | 19,399 | 2007 | 19,131 | 2006 | 17,530 | 2005 | 17,392 | 2004 | 19,073 | 2003 | 16,908 | 2002 | 15,081 | 2001 | 13,321 | 2000 | 12,551 | 1999 | 12,100 | 1998 | 12,000 | 1997 | 11,500 | 1996 | 10,600 | 1995 | 10,900 | 1994 | 11,500 | 1993 | 10,800 | 1992 | 10,300 | 1991 | 8,000 | 1990 | 7,600 | 1989 | 6,700 | 1988 | 6,600 | 1987 | 6,400 | 1986 | 6,400 | 1985 | 6,100 | 1984 | 6,200 | 1983 | 5,900 | 1982 | 5,700 | 1981 | 5,700 | 1980 | 6,200 | 1979 | 5,400 | 1978 | 5,200 | 1977 | 5,200 | 1976 | 4,700 | 1975 | 3,500 | 1974 | 2,000 | 1973 | 4,300 | 1972 | 4,000 | 1971 | 3,100 | 1970 | 2,600 |
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