| Year | Value | | 2022 | 9,753 | | 2021 | 9,298 | | 2020 | 8,876 | | 2019 | 8,600 | | 2018 | 8,524 | | 2017 | 8,500 | | 2016 | 8,512 | | 2015 | 8,538 | | 2014 | 8,562 | | 2013 | 8,592 | | 2012 | 8,632 | | 2011 | 8,605 | | 2010 | 8,540 | | 2009 | 8,534 | | 2008 | 8,560 | | 2007 | 8,585 | | 2006 | 8,577 | | 2005 | 8,509 | | 2004 | 8,363 | | 2003 | 8,147 | | 2002 | 7,877 | | 2001 | 7,574 | | 2000 | 7,223 | | 1999 | 6,840 | | 1998 | 6,472 | | 1997 | 6,131 | | 1996 | 5,836 | | 1995 | 5,587 | | 1994 | 5,492 | | 1993 | 5,551 | | 1992 | 5,642 | | 1991 | 5,746 | | 1990 | 5,828 | | 1989 | 5,710 | | 1988 | 5,411 | | 1987 | 5,118 | | 1986 | 4,860 | | 1985 | 4,647 | | 1984 | 4,483 | | 1983 | 4,371 | | 1982 | 4,292 | | 1981 | 4,267 | | 1980 | 4,262 | | 1979 | 4,203 | | 1978 | 4,091 | | 1977 | 3,948 | | 1976 | 3,802 | | 1975 | 3,665 | | 1974 | 3,550 | | 1973 | 3,459 | | 1972 | 3,383 | | 1971 | 3,305 | | 1970 | 3,184 | | 1969 | 2,952 | | 1968 | 2,668 | | 1967 | 2,448 | | 1966 | 2,359 | | 1965 | 2,478 | | 1964 | 2,848 | | 1963 | 3,459 | | 1962 | 4,242 | | 1961 | 5,080 | | 1960 | 5,440 |
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