Year | Value | 2022 | 23,004 | 2021 | 22,607 | 2020 | 22,529 | 2019 | 22,487 | 2018 | 22,441 | 2017 | 22,441 | 2016 | 22,212 | 2015 | 21,985 | 2014 | 21,694 | 2013 | 21,278 | 2012 | 20,805 | 2011 | 20,269 | 2010 | 19,807 | 2009 | 19,299 | 2008 | 18,706 | 2007 | 18,232 | 2006 | 17,810 | 2005 | 17,296 | 2004 | 16,819 | 2003 | 16,437 | 2002 | 16,011 | 2001 | 15,451 | 2000 | 15,012 | 1999 | 14,733 | 1998 | 14,368 | 1997 | 13,991 | 1996 | 13,713 | 1995 | 13,362 | 1994 | 12,843 | 1993 | 12,451 | 1992 | 12,140 | 1991 | 11,771 | 1990 | 11,573 | 1989 | 11,634 | 1988 | 11,703 | 1987 | 11,635 | 1986 | 11,584 | 1985 | 11,590 | 1984 | 11,504 | 1983 | 11,384 | 1982 | 11,373 | 1981 | 11,553 | 1980 | 11,824 | 1979 | 12,095 | 1978 | 12,373 | 1977 | 12,575 | 1976 | 12,624 | 1975 | 12,496 | 1974 | 12,258 | 1973 | 12,081 | 1972 | 11,911 | 1971 | 11,714 | 1970 | 11,664 | 1969 | 11,482 | 1968 | 10,859 | 1967 | 10,187 | 1966 | 9,661 | 1965 | 9,198 | 1964 | 9,156 | 1963 | 9,677 | 1962 | 10,398 | 1961 | 11,039 | 1960 | 11,455 |
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