Year | Value | 2022 | 22,001 | 2021 | 22,343 | 2020 | 22,573 | 2019 | 23,160 | 2018 | 23,025 | 2017 | 22,461 | 2016 | 22,614 | 2015 | 22,714 | 2014 | 22,805 | 2013 | 22,915 | 2012 | 22,992 | 2011 | 23,125 | 2010 | 23,334 | 2009 | 23,502 | 2008 | 23,624 | 2007 | 23,694 | 2006 | 23,720 | 2005 | 23,701 | 2004 | 23,619 | 2003 | 23,459 | 2002 | 23,159 | 2001 | 22,705 | 2000 | 22,153 | 1999 | 21,535 | 1998 | 20,897 | 1997 | 20,292 | 1996 | 19,768 | 1995 | 19,344 | 1994 | 19,004 | 1993 | 18,699 | 1992 | 18,384 | 1991 | 17,969 | 1990 | 17,432 | 1989 | 16,795 | 1988 | 16,086 | 1987 | 15,397 | 1986 | 14,802 | 1985 | 14,357 | 1984 | 14,095 | 1983 | 13,996 | 1982 | 14,017 | 1981 | 14,102 | 1980 | 14,174 | 1979 | 14,163 | 1978 | 14,065 | 1977 | 13,920 | 1976 | 13,773 | 1975 | 13,671 | 1974 | 13,643 | 1973 | 13,688 | 1972 | 13,781 | 1971 | 13,894 | 1970 | 14,014 | 1969 | 14,105 | 1968 | 14,128 | 1967 | 14,078 | 1966 | 13,943 | 1965 | 13,714 | 1964 | 13,391 | 1963 | 13,015 | 1962 | 12,644 | 1961 | 12,344 | 1960 | 12,086 |
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