| Year | Value | | 2022 | 31,529 | | 2021 | 30,523 | | 2020 | 29,571 | | 2019 | 28,520 | | 2018 | 27,419 | | 2017 | 26,366 | | 2016 | 25,319 | | 2015 | 24,257 | | 2014 | 23,185 | | 2013 | 22,123 | | 2012 | 21,095 | | 2011 | 20,130 | | 2010 | 19,245 | | 2009 | 18,438 | | 2008 | 17,694 | | 2007 | 16,992 | | 2006 | 16,317 | | 2005 | 15,660 | | 2004 | 15,019 | | 2003 | 14,391 | | 2002 | 13,783 | | 2001 | 13,202 | | 2000 | 12,652 | | 1999 | 12,132 | | 1998 | 11,642 | | 1997 | 11,173 | | 1996 | 10,716 | | 1995 | 10,271 | | 1994 | 9,848 | | 1993 | 9,457 | | 1992 | 9,111 | | 1991 | 8,827 | | 1990 | 8,609 | | 1989 | 8,459 | | 1988 | 8,355 | | 1987 | 8,270 | | 1986 | 8,189 | | 1985 | 8,091 | | 1984 | 7,961 | | 1983 | 7,788 | | 1982 | 7,575 | | 1981 | 7,328 | | 1980 | 7,058 | | 1979 | 6,790 | | 1978 | 6,541 | | 1977 | 6,316 | | 1976 | 6,120 | | 1975 | 5,944 | | 1974 | 5,774 | | 1973 | 5,598 | | 1972 | 5,403 | | 1971 | 5,182 | | 1970 | 4,941 | | 1969 | 4,687 | | 1968 | 4,432 | | 1967 | 4,189 | | 1966 | 3,974 | | 1965 | 3,796 | | 1964 | 3,661 | | 1963 | 3,566 | | 1962 | 3,504 | | 1961 | 3,468 | | 1960 | 3,444 |
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