| Year | Value | | 2022 | 34,109 | | 2021 | 32,261 | | 2020 | 30,716 | | 2019 | 29,354 | | 2018 | 28,203 | | 2017 | 27,190 | | 2016 | 26,194 | | 2015 | 25,219 | | 2014 | 24,299 | | 2013 | 23,432 | | 2012 | 22,699 | | 2011 | 22,116 | | 2010 | 21,645 | | 2009 | 21,145 | | 2008 | 20,770 | | 2007 | 20,544 | | 2006 | 20,145 | | 2005 | 19,594 | | 2004 | 18,989 | | 2003 | 18,346 | | 2002 | 17,740 | | 2001 | 17,258 | | 2000 | 16,744 | | 1999 | 16,349 | | 1998 | 16,193 | | 1997 | 16,171 | | 1996 | 16,037 | | 1995 | 15,621 | | 1994 | 15,096 | | 1993 | 14,542 | | 1992 | 14,093 | | 1991 | 13,872 | | 1990 | 13,906 | | 1989 | 14,160 | | 1988 | 14,491 | | 1987 | 14,677 | | 1986 | 14,599 | | 1985 | 14,269 | | 1984 | 13,729 | | 1983 | 13,033 | | 1982 | 12,397 | | 1981 | 11,989 | | 1980 | 11,722 | | 1979 | 11,513 | | 1978 | 11,309 | | 1977 | 11,079 | | 1976 | 10,855 | | 1975 | 10,674 | | 1974 | 10,502 | | 1973 | 10,311 | | 1972 | 10,126 | | 1971 | 9,951 | | 1970 | 9,789 | | 1969 | 9,642 | | 1968 | 9,515 | | 1967 | 9,394 | | 1966 | 9,237 | | 1965 | 9,019 | | 1964 | 8,743 | | 1963 | 8,401 | | 1962 | 8,012 | | 1961 | 7,645 | | 1960 | 7,344 |
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