| Year | Value | | 2022 | 52,398 | | 2021 | 50,391 | | 2020 | 48,507 | | 2019 | 46,611 | | 2018 | 44,806 | | 2017 | 43,122 | | 2016 | 41,474 | | 2015 | 39,908 | | 2014 | 38,416 | | 2013 | 36,977 | | 2012 | 35,578 | | 2011 | 34,197 | | 2010 | 32,818 | | 2009 | 31,454 | | 2008 | 30,121 | | 2007 | 28,831 | | 2006 | 27,605 | | 2005 | 26,457 | | 2004 | 25,382 | | 2003 | 24,371 | | 2002 | 23,425 | | 2001 | 22,544 | | 2000 | 21,724 | | 1999 | 20,962 | | 1998 | 20,254 | | 1997 | 19,594 | | 1996 | 18,979 | | 1995 | 18,395 | | 1994 | 17,831 | | 1993 | 17,276 | | 1992 | 16,714 | | 1991 | 16,140 | | 1990 | 15,562 | | 1989 | 15,003 | | 1988 | 14,483 | | 1987 | 14,017 | | 1986 | 13,618 | | 1985 | 13,286 | | 1984 | 13,000 | | 1983 | 12,727 | | 1982 | 12,440 | | 1981 | 12,121 | | 1980 | 11,757 | | 1979 | 11,348 | | 1978 | 10,904 | | 1977 | 10,446 | | 1976 | 9,989 | | 1975 | 9,552 | | 1974 | 9,157 | | 1973 | 8,813 | | 1972 | 8,516 | | 1971 | 8,258 | | 1970 | 8,031 | | 1969 | 7,815 | | 1968 | 7,592 | | 1967 | 7,358 | | 1966 | 7,110 | | 1965 | 6,855 | | 1964 | 6,601 | | 1963 | 6,364 | | 1962 | 6,150 | | 1961 | 5,961 | | 1960 | 5,798 |
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