| Year | Value | | 2022 | 47,068 | | 2021 | 45,557 | | 2020 | 44,183 | | 2019 | 42,725 | | 2018 | 41,093 | | 2017 | 39,360 | | 2016 | 37,723 | | 2015 | 36,104 | | 2014 | 34,588 | | 2013 | 33,225 | | 2012 | 31,998 | | 2011 | 30,870 | | 2010 | 29,804 | | 2009 | 28,767 | | 2008 | 27,725 | | 2007 | 26,655 | | 2006 | 25,551 | | 2005 | 24,417 | | 2004 | 23,271 | | 2003 | 22,132 | | 2002 | 21,028 | | 2001 | 19,984 | | 2000 | 19,077 | | 1999 | 18,306 | | 1998 | 17,598 | | 1997 | 16,928 | | 1996 | 16,262 | | 1995 | 15,586 | | 1994 | 14,890 | | 1993 | 14,173 | | 1992 | 13,426 | | 1991 | 12,647 | | 1990 | 11,813 | | 1989 | 10,983 | | 1988 | 10,193 | | 1987 | 9,396 | | 1986 | 8,605 | | 1985 | 7,845 | | 1984 | 7,139 | | 1983 | 6,492 | | 1982 | 5,904 | | 1981 | 5,371 | | 1980 | 4,938 | | 1979 | 4,624 | | 1978 | 4,392 | | 1977 | 4,231 | | 1976 | 4,110 | | 1975 | 3,990 | | 1974 | 3,866 | | 1973 | 3,742 | | 1972 | 3,616 | | 1971 | 3,505 | | 1970 | 3,454 | | 1969 | 3,470 | | 1968 | 3,523 | | 1967 | 3,603 | | 1966 | 3,672 | | 1965 | 3,718 | | 1964 | 3,748 | | 1963 | 3,752 | | 1962 | 3,724 | | 1961 | 3,676 | | 1960 | 3,596 |
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