| Year | Value | | 2022 | 46,589 | | 2021 | 45,598 | | 2020 | 44,474 | | 2019 | 43,286 | | 2018 | 41,588 | | 2017 | 39,774 | | 2016 | 38,132 | | 2015 | 36,524 | | 2014 | 34,982 | | 2013 | 33,881 | | 2012 | 33,461 | | 2011 | 33,738 | | 2010 | 34,264 | | 2009 | 33,663 | | 2008 | 32,047 | | 2007 | 30,323 | | 2006 | 28,469 | | 2005 | 26,524 | | 2004 | 24,514 | | 2003 | 22,598 | | 2002 | 20,980 | | 2001 | 19,568 | | 2000 | 18,218 | | 1999 | 16,925 | | 1998 | 15,688 | | 1997 | 14,503 | | 1996 | 13,376 | | 1995 | 12,324 | | 1994 | 11,359 | | 1993 | 10,491 | | 1992 | 9,720 | | 1991 | 9,031 | | 1990 | 8,387 | | 1989 | 7,830 | | 1988 | 7,418 | | 1987 | 7,129 | | 1986 | 6,928 | | 1985 | 6,791 | | 1984 | 6,682 | | 1983 | 6,566 | | 1982 | 6,437 | | 1981 | 6,281 | | 1980 | 6,071 | | 1979 | 5,836 | | 1978 | 5,623 | | 1977 | 5,433 | | 1976 | 5,250 | | 1975 | 5,064 | | 1974 | 4,880 | | 1973 | 4,696 | | 1972 | 4,521 | | 1971 | 4,366 | | 1970 | 4,226 | | 1969 | 4,079 | | 1968 | 3,923 | | 1967 | 3,756 | | 1966 | 3,575 | | 1965 | 3,387 | | 1964 | 3,220 | | 1963 | 3,086 | | 1962 | 2,966 | | 1961 | 2,856 | | 1960 | 2,762 |
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