Year | Value | 2021 | 5,635 | 2020 | 6,289.09 | 2019 | 19,317 | 2018 | 20,903 | 2017 | 12,799 | 2016 | 12,305 | 2015 | 13,639 | 2014 | 14,022 | 2013 | 14,257 | 2012 | 13,845 | 2011 | 14,891 | 2010 | 16,828 | 2009 | 18,362 | 2008 | 17,334 | 2007 | 16,895 | 2006 | 15,359 | 2005 | 14,768 | 2004 | 14,356 | 2003 | 14,390 | 2002 | 14,594 | 2001 | 15,056 | 2000 | 15,394 | 1999 | 14,100 | 1998 | 12,700 | 1997 | 13,400 | 1996 | 13,600 | 1995 | 12,800 | 1994 | 11,300 | 1993 | 9,500 | 1992 | 7,500 | 1991 | 6,800 | 1990 | 6,600 | 1989 | 6,000 | 1988 | 5,300 | 1987 | 4,700 | 1986 | 4,500 | 1985 | 4,000 | 1984 | 4,000 | 1983 | 4,400 | 1982 | 4,800 | 1981 | 4,600 | 1980 | 4,300 | 1979 | 3,600 | 1978 | 3,400 | 1977 | 2,500 | 1976 | 2,400 | 1975 | 2,400 | 1974 | 2,100 | 1973 | 1,700 | 1972 | 1,500 | 1971 | 1,900 | 1970 | 2,400 |
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