| Year | Value | | 2022 | 5,669 | | 2021 | 5,778 | | 2020 | 5,934 | | 2019 | 6,082 | | 2018 | 6,221 | | 2017 | 6,346 | | 2016 | 6,458 | | 2015 | 6,556 | | 2014 | 6,638 | | 2013 | 6,705 | | 2012 | 6,754 | | 2011 | 6,788 | | 2010 | 6,805 | | 2009 | 6,812 | | 2008 | 6,819 | | 2007 | 6,822 | | 2006 | 6,820 | | 2005 | 6,813 | | 2004 | 6,801 | | 2003 | 6,781 | | 2002 | 6,752 | | 2001 | 6,713 | | 2000 | 6,646 | | 1999 | 6,836 | | 1998 | 7,094 | | 1997 | 7,352 | | 1996 | 7,607 | | 1995 | 7,861 | | 1994 | 8,112 | | 1993 | 8,365 | | 1992 | 8,619 | | 1991 | 8,874 | | 1990 | 9,110 | | 1989 | 9,136 | | 1988 | 9,058 | | 1987 | 8,980 | | 1986 | 8,900 | | 1985 | 8,820 | | 1984 | 8,739 | | 1983 | 8,659 | | 1982 | 8,579 | | 1981 | 8,500 | | 1980 | 8,442 | | 1979 | 8,373 | | 1978 | 8,329 | | 1977 | 8,283 | | 1976 | 8,232 | | 1975 | 8,176 | | 1974 | 8,133 | | 1973 | 8,109 | | 1972 | 8,087 | | 1971 | 8,062 | | 1970 | 8,019 | | 1969 | 7,924 | | 1968 | 7,791 | | 1967 | 7,662 | | 1966 | 7,538 | | 1965 | 7,407 | | 1964 | 7,269 | | 1963 | 7,135 | | 1962 | 7,005 | | 1961 | 6,881 | | 1960 | 6,787 |
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