| Year | Value | | 2022 | 17,105 | | 2021 | 16,475 | | 2020 | 15,662 | | 2019 | 14,719 | | 2018 | 14,118 | | 2017 | 13,547 | | 2016 | 13,072 | | 2015 | 12,648 | | 2014 | 12,216 | | 2013 | 11,758 | | 2012 | 11,297 | | 2011 | 10,883 | | 2010 | 10,495 | | 2009 | 10,159 | | 2008 | 9,944 | | 2007 | 9,813 | | 2006 | 9,671 | | 2005 | 9,459 | | 2004 | 9,193 | | 2003 | 8,941 | | 2002 | 8,728 | | 2001 | 8,488 | | 2000 | 8,236 | | 1999 | 8,217 | | 1998 | 8,439 | | 1997 | 8,704 | | 1996 | 8,933 | | 1995 | 9,060 | | 1994 | 9,074 | | 1993 | 9,009 | | 1992 | 8,887 | | 1991 | 8,711 | | 1990 | 8,509 | | 1989 | 8,311 | | 1988 | 8,136 | | 1987 | 7,995 | | 1986 | 7,850 | | 1985 | 7,666 | | 1984 | 7,455 | | 1983 | 7,236 | | 1982 | 6,995 | | 1981 | 6,674 | | 1980 | 6,291 | | 1979 | 5,900 | | 1978 | 5,650 | | 1977 | 5,577 | | 1976 | 5,549 | | 1975 | 5,523 | | 1974 | 5,471 | | 1973 | 5,386 | | 1972 | 5,283 | | 1971 | 5,163 | | 1970 | 5,040 | | 1969 | 4,918 | | 1968 | 4,729 | | 1967 | 4,518 | | 1966 | 4,376 | | 1965 | 4,280 | | 1964 | 4,215 | | 1963 | 4,165 | | 1962 | 3,725 | | 1961 | 2,979 | | 1960 | 2,396 |
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