| Year | Value | | 2022 | 9,028 | | 2021 | 9,277 | | 2020 | 9,757 | | 2019 | 10,053 | | 2018 | 9,984 | | 2017 | 9,697 | | 2016 | 9,225 | | 2015 | 8,668 | | 2014 | 8,151 | | 2013 | 7,839 | | 2012 | 7,638 | | 2011 | 7,537 | | 2010 | 7,445 | | 2009 | 7,301 | | 2008 | 7,042 | | 2007 | 6,676 | | 2006 | 6,289 | | 2005 | 5,954 | | 2004 | 5,739 | | 2003 | 5,691 | | 2002 | 5,753 | | 2001 | 5,849 | | 2000 | 5,900 | | 1999 | 5,912 | | 1998 | 5,930 | | 1997 | 5,884 | | 1996 | 5,739 | | 1995 | 5,571 | | 1994 | 5,492 | | 1993 | 5,543 | | 1992 | 5,689 | | 1991 | 5,870 | | 1990 | 6,041 | | 1989 | 6,167 | | 1988 | 6,246 | | 1987 | 6,278 | | 1986 | 6,261 | | 1985 | 6,231 | | 1984 | 6,220 | | 1983 | 6,253 | | 1982 | 6,327 | | 1981 | 6,394 | | 1980 | 6,408 | | 1979 | 6,358 | | 1978 | 6,309 | | 1977 | 6,244 | | 1976 | 6,065 | | 1975 | 5,787 | | 1974 | 5,490 | | 1973 | 5,273 | | 1972 | 5,195 | | 1971 | 5,240 | | 1970 | 5,339 | | 1969 | 5,398 | | 1968 | 5,336 | | 1967 | 5,188 | | 1966 | 5,034 | | 1965 | 4,894 | | 1964 | 4,771 | | 1963 | 4,646 | | 1962 | 4,165 | | 1961 | 3,436 | | 1960 | 2,862 |
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