| Year | Value | | 2022 | 63,634 | | 2021 | 62,388 | | 2020 | 60,654 | | 2019 | 58,148 | | 2018 | 54,817 | | 2017 | 51,186 | | 2016 | 47,486 | | 2015 | 43,900 | | 2014 | 40,578 | | 2013 | 37,613 | | 2012 | 35,011 | | 2011 | 32,750 | | 2010 | 30,931 | | 2009 | 29,546 | | 2008 | 28,433 | | 2007 | 27,487 | | 2006 | 26,633 | | 2005 | 25,828 | | 2004 | 25,076 | | 2003 | 24,418 | | 2002 | 23,877 | | 2001 | 23,435 | | 2000 | 23,037 | | 1999 | 22,571 | | 1998 | 22,025 | | 1997 | 21,465 | | 1996 | 20,897 | | 1995 | 20,319 | | 1994 | 19,733 | | 1993 | 19,105 | | 1992 | 18,434 | | 1991 | 17,767 | | 1990 | 17,111 | | 1989 | 16,458 | | 1988 | 15,804 | | 1987 | 15,134 | | 1986 | 14,403 | | 1985 | 13,560 | | 1984 | 12,624 | | 1983 | 11,483 | | 1982 | 10,404 | | 1981 | 9,620 | | 1980 | 8,980 | | 1979 | 8,470 | | 1978 | 8,233 | | 1977 | 8,264 | | 1976 | 8,406 | | 1975 | 8,615 | | 1974 | 8,836 | | 1973 | 9,081 | | 1972 | 9,339 | | 1971 | 9,599 | | 1970 | 9,825 | | 1969 | 9,971 | | 1968 | 9,959 | | 1967 | 9,839 | | 1966 | 9,712 | | 1965 | 9,579 | | 1964 | 9,440 | | 1963 | 9,292 | | 1962 | 9,142 | | 1961 | 9,000 | | 1960 | 8,875 |
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