| Year | Value | | 2022 | 30,352 | | 2021 | 29,556 | | 2020 | 28,691 | | 2019 | 27,750 | | 2018 | 26,755 | | 2017 | 25,737 | | 2016 | 24,720 | | 2015 | 23,720 | | 2014 | 22,742 | | 2013 | 21,793 | | 2012 | 20,875 | | 2011 | 19,994 | | 2010 | 19,151 | | 2009 | 18,340 | | 2008 | 17,564 | | 2007 | 16,842 | | 2006 | 16,150 | | 2005 | 15,539 | | 2004 | 15,032 | | 2003 | 14,564 | | 2002 | 14,027 | | 2001 | 13,431 | | 2000 | 12,966 | | 1999 | 12,679 | | 1998 | 12,455 | | 1997 | 12,186 | | 1996 | 11,957 | | 1995 | 11,790 | | 1994 | 11,648 | | 1993 | 11,309 | | 1992 | 11,411 | | 1991 | 11,416 | | 1990 | 10,413 | | 1989 | 9,350 | | 1988 | 8,618 | | 1987 | 8,053 | | 1986 | 7,533 | | 1985 | 7,096 | | 1984 | 6,753 | | 1983 | 6,483 | | 1982 | 6,244 | | 1981 | 5,993 | | 1980 | 5,686 | | 1979 | 5,308 | | 1978 | 4,876 | | 1977 | 4,431 | | 1976 | 4,011 | | 1975 | 3,645 | | 1974 | 3,342 | | 1973 | 3,094 | | 1972 | 2,879 | | 1971 | 2,685 | | 1970 | 2,512 | | 1969 | 2,355 | | 1968 | 2,220 | | 1967 | 2,105 | | 1966 | 1,992 | | 1965 | 1,880 | | 1964 | 1,773 | | 1963 | 1,676 | | 1962 | 1,594 | | 1961 | 1,525 | | 1960 | 1,465 |
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