| Year | Value | | 2022 | 43,238 | | 2021 | 41,519 | | 2020 | 39,743 | | 2019 | 37,679 | | 2018 | 35,323 | | 2017 | 33,033 | | 2016 | 30,957 | | 2015 | 29,238 | | 2014 | 27,933 | | 2013 | 26,940 | | 2012 | 26,073 | | 2011 | 25,123 | | 2010 | 23,887 | | 2009 | 22,336 | | 2008 | 20,658 | | 2007 | 19,079 | | 2006 | 17,764 | | 2005 | 16,792 | | 2004 | 16,124 | | 2003 | 15,636 | | 2002 | 15,190 | | 2001 | 14,704 | | 2000 | 14,167 | | 1999 | 13,568 | | 1998 | 12,821 | | 1997 | 11,981 | | 1996 | 11,179 | | 1995 | 10,421 | | 1994 | 9,679 | | 1993 | 9,102 | | 1992 | 8,723 | | 1991 | 8,382 | | 1990 | 8,059 | | 1989 | 7,766 | | 1988 | 7,508 | | 1987 | 7,276 | | 1986 | 7,042 | | 1985 | 6,787 | | 1984 | 6,497 | | 1983 | 6,183 | | 1982 | 5,873 | | 1981 | 5,600 | | 1980 | 5,392 | | 1979 | 5,291 | | 1978 | 5,288 | | 1977 | 5,338 | | 1976 | 5,476 | | 1975 | 5,681 | | 1974 | 5,881 | | 1973 | 6,079 | | 1972 | 6,275 | | 1971 | 6,471 | | 1970 | 6,655 | | 1969 | 6,786 | | 1968 | 6,795 | | 1967 | 6,717 | | 1966 | 6,628 | | 1965 | 6,527 | | 1964 | 6,415 | | 1963 | 6,297 | | 1962 | 6,172 | | 1961 | 6,052 | | 1960 | 5,947 |
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