| Year | Value | | 2022 | 25,083 | | 2021 | 24,356 | | 2020 | 23,548 | | 2019 | 22,675 | | 2018 | 21,757 | | 2017 | 20,783 | | 2016 | 19,779 | | 2015 | 18,804 | | 2014 | 17,895 | | 2013 | 17,061 | | 2012 | 16,327 | | 2011 | 15,732 | | 2010 | 15,284 | | 2009 | 14,995 | | 2008 | 14,803 | | 2007 | 14,618 | | 2006 | 14,414 | | 2005 | 14,166 | | 2004 | 13,866 | | 2003 | 13,479 | | 2002 | 12,962 | | 2001 | 12,303 | | 2000 | 11,482 | | 1999 | 10,620 | | 1998 | 9,831 | | 1997 | 9,102 | | 1996 | 8,442 | | 1995 | 7,840 | | 1994 | 7,247 | | 1993 | 6,645 | | 1992 | 6,063 | | 1991 | 5,535 | | 1990 | 5,090 | | 1989 | 4,719 | | 1988 | 4,414 | | 1987 | 4,172 | | 1986 | 3,982 | | 1985 | 3,852 | | 1984 | 3,783 | | 1983 | 3,767 | | 1982 | 3,790 | | 1981 | 3,849 | | 1980 | 3,965 | | 1979 | 4,195 | | 1978 | 4,466 | | 1977 | 4,687 | | 1976 | 4,869 | | 1975 | 5,028 | | 1974 | 5,215 | | 1973 | 5,433 | | 1972 | 5,642 | | 1971 | 5,800 | | 1970 | 5,824 | | 1969 | 5,752 | | 1968 | 5,663 | | 1967 | 5,553 | | 1966 | 5,427 | | 1965 | 5,292 | | 1964 | 5,156 | | 1963 | 5,021 | | 1962 | 4,888 | | 1961 | 4,765 | | 1960 | 4,679 |
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