| Year | Value | | 2022 | 35,705 | | 2021 | 35,260 | | 2020 | 34,745 | | 2019 | 34,127 | | 2018 | 33,406 | | 2017 | 32,592 | | 2016 | 31,699 | | 2015 | 30,734 | | 2014 | 29,704 | | 2013 | 28,632 | | 2012 | 27,538 | | 2011 | 26,444 | | 2010 | 25,366 | | 2009 | 24,310 | | 2008 | 23,286 | | 2007 | 22,315 | | 2006 | 21,380 | | 2005 | 20,554 | | 2004 | 19,875 | | 2003 | 19,252 | | 2002 | 18,514 | | 2001 | 17,633 | | 2000 | 16,794 | | 1999 | 16,002 | | 1998 | 15,189 | | 1997 | 14,348 | | 1996 | 13,704 | | 1995 | 13,418 | | 1994 | 13,501 | | 1993 | 13,544 | | 1992 | 14,150 | | 1991 | 14,531 | | 1990 | 13,473 | | 1989 | 12,158 | | 1988 | 11,165 | | 1987 | 10,377 | | 1986 | 9,660 | | 1985 | 9,061 | | 1984 | 8,596 | | 1983 | 8,244 | | 1982 | 7,945 | | 1981 | 7,624 | | 1980 | 7,230 | | 1979 | 6,750 | | 1978 | 6,198 | | 1977 | 5,627 | | 1976 | 5,096 | | 1975 | 4,636 | | 1974 | 4,254 | | 1973 | 3,940 | | 1972 | 3,669 | | 1971 | 3,424 | | 1970 | 3,205 | | 1969 | 3,005 | | 1968 | 2,832 | | 1967 | 2,684 | | 1966 | 2,542 | | 1965 | 2,405 | | 1964 | 2,274 | | 1963 | 2,154 | | 1962 | 2,050 | | 1961 | 1,960 | | 1960 | 1,880 |
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