| Year | Value | | 2022 | 41,237 | | 2021 | 41,659 | | 2020 | 42,464 | | 2019 | 42,967 | | 2018 | 42,299 | | 2017 | 40,705 | | 2016 | 39,297 | | 2015 | 38,585 | | 2014 | 38,677 | | 2013 | 39,253 | | 2012 | 39,824 | | 2011 | 40,070 | | 2010 | 39,936 | | 2009 | 39,588 | | 2008 | 39,214 | | 2007 | 38,938 | | 2006 | 37,068 | | 2005 | 33,657 | | 2004 | 30,480 | | 2003 | 27,440 | | 2002 | 24,433 | | 2001 | 21,482 | | 2000 | 18,722 | | 1999 | 16,272 | | 1998 | 14,176 | | 1997 | 12,440 | | 1996 | 11,042 | | 1995 | 9,928 | | 1994 | 9,046 | | 1993 | 8,335 | | 1992 | 7,825 | | 1991 | 7,481 | | 1990 | 7,185 | | 1989 | 6,931 | | 1988 | 6,681 | | 1987 | 6,434 | | 1986 | 6,220 | | 1985 | 6,041 | | 1984 | 5,903 | | 1983 | 5,792 | | 1982 | 5,702 | | 1981 | 5,694 | | 1980 | 5,761 | | 1979 | 5,814 | | 1978 | 5,860 | | 1977 | 5,914 | | 1976 | 5,988 | | 1975 | 6,135 | | 1974 | 6,388 | | 1973 | 6,723 | | 1972 | 7,113 | | 1971 | 7,559 | | 1970 | 8,099 | | 1969 | 8,066 | | 1968 | 7,403 | | 1967 | 6,751 | | 1966 | 6,148 | | 1965 | 5,630 | | 1964 | 5,194 | | 1963 | 4,827 | | 1962 | 4,525 | | 1961 | 4,370 | | 1960 | 4,331 |
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