Year | Value | 2022 | 23,917 | 2021 | 23,157 | 2020 | 22,411 | 2019 | 21,649 | 2018 | 20,887 | 2017 | 20,160 | 2016 | 19,375 | 2015 | 18,627 | 2014 | 17,826 | 2013 | 17,082 | 2012 | 16,427 | 2011 | 15,860 | 2010 | 15,342 | 2009 | 14,876 | 2008 | 14,549 | 2007 | 14,289 | 2006 | 14,020 | 2005 | 13,627 | 2004 | 13,063 | 2003 | 12,509 | 2002 | 12,044 | 2001 | 11,583 | 2000 | 11,426 | 1999 | 11,516 | 1998 | 11,334 | 1997 | 11,086 | 1996 | 11,045 | 1995 | 11,041 | 1994 | 10,863 | 1993 | 10,693 | 1992 | 10,637 | 1991 | 10,674 | 1990 | 10,885 | 1989 | 11,210 | 1988 | 11,485 | 1987 | 11,663 | 1986 | 11,642 | 1985 | 11,294 | 1984 | 10,692 | 1983 | 10,039 | 1982 | 9,422 | 1981 | 8,930 | 1980 | 8,689 | 1979 | 8,573 | 1978 | 8,385 | 1977 | 8,159 | 1976 | 7,981 | 1975 | 7,869 | 1974 | 8,021 | 1973 | 8,450 | 1972 | 9,047 | 1971 | 9,635 | 1970 | 10,049 | 1969 | 10,257 | 1968 | 10,371 | 1967 | 10,517 | 1966 | 10,690 | 1965 | 10,794 | 1964 | 10,760 | 1963 | 10,659 | 1962 | 10,521 | 1961 | 10,415 | 1960 | 10,300 |
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