| Year | Value | | 2022 | 9,548 | | 2021 | 9,504 | | 2020 | 9,592 | | 2019 | 9,755 | | 2018 | 9,939 | | 2017 | 10,171 | | 2016 | 10,419 | | 2015 | 10,570 | | 2014 | 10,593 | | 2013 | 10,542 | | 2012 | 10,466 | | 2011 | 10,441 | | 2010 | 10,534 | | 2009 | 10,752 | | 2008 | 11,023 | | 2007 | 11,240 | | 2006 | 11,401 | | 2005 | 11,523 | | 2004 | 11,559 | | 2003 | 11,498 | | 2002 | 11,432 | | 2001 | 11,347 | | 2000 | 11,180 | | 1999 | 10,979 | | 1998 | 10,763 | | 1997 | 10,481 | | 1996 | 10,099 | | 1995 | 9,699 | | 1994 | 9,323 | | 1993 | 8,958 | | 1992 | 8,586 | | 1991 | 8,200 | | 1990 | 7,806 | | 1989 | 7,408 | | 1988 | 6,994 | | 1987 | 6,568 | | 1986 | 6,147 | | 1985 | 5,751 | | 1984 | 5,405 | | 1983 | 5,132 | | 1982 | 4,964 | | 1981 | 4,900 | | 1980 | 4,920 | | 1979 | 5,064 | | 1978 | 5,289 | | 1977 | 5,488 | | 1976 | 5,656 | | 1975 | 5,816 | | 1974 | 5,957 | | 1973 | 6,075 | | 1972 | 6,166 | | 1971 | 6,218 | | 1970 | 6,229 | | 1969 | 6,214 | | 1968 | 6,179 | | 1967 | 6,142 | | 1966 | 6,136 | | 1965 | 6,179 | | 1964 | 6,267 | | 1963 | 6,397 | | 1962 | 6,561 | | 1961 | 6,736 | | 1960 | 6,883 |
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