| Year | Value | | 2022 | 27,379 | | 2021 | 25,551 | | 2020 | 23,665 | | 2019 | 21,887 | | 2018 | 20,165 | | 2017 | 18,565 | | 2016 | 17,144 | | 2015 | 15,876 | | 2014 | 14,700 | | 2013 | 13,592 | | 2012 | 12,570 | | 2011 | 11,634 | | 2010 | 10,770 | | 2009 | 10,008 | | 2008 | 9,377 | | 2007 | 8,870 | | 2006 | 8,496 | | 2005 | 8,278 | | 2004 | 8,129 | | 2003 | 7,919 | | 2002 | 7,615 | | 2001 | 7,214 | | 2000 | 6,731 | | 1999 | 6,197 | | 1998 | 5,673 | | 1997 | 5,209 | | 1996 | 4,812 | | 1995 | 4,474 | | 1994 | 4,209 | | 1993 | 4,015 | | 1992 | 3,879 | | 1991 | 3,792 | | 1990 | 3,746 | | 1989 | 3,720 | | 1988 | 3,713 | | 1987 | 3,731 | | 1986 | 3,768 | | 1985 | 3,831 | | 1984 | 3,910 | | 1983 | 3,981 | | 1982 | 4,030 | | 1981 | 4,058 | | 1980 | 4,064 | | 1979 | 4,052 | | 1978 | 4,030 | | 1977 | 4,022 | | 1976 | 4,028 | | 1975 | 4,026 | | 1974 | 4,002 | | 1973 | 3,941 | | 1972 | 3,857 | | 1971 | 3,766 | | 1970 | 3,666 | | 1969 | 3,562 | | 1968 | 3,453 | | 1967 | 3,313 | | 1966 | 3,134 | | 1965 | 2,969 | | 1964 | 2,872 | | 1963 | 2,816 | | 1962 | 2,756 | | 1961 | 2,695 | | 1960 | 2,631 |
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