| Year | Value | | 2022 | 10,355 | | 2021 | 9,918 | | 2020 | 9,478 | | 2019 | 8,967 | | 2018 | 8,493 | | 2017 | 8,091 | | 2016 | 7,739 | | 2015 | 7,446 | | 2014 | 7,306 | | 2013 | 7,241 | | 2012 | 7,163 | | 2011 | 7,119 | | 2010 | 7,065 | | 2009 | 6,984 | | 2008 | 6,900 | | 2007 | 6,824 | | 2006 | 6,762 | | 2005 | 6,706 | | 2004 | 6,656 | | 2003 | 6,633 | | 2002 | 6,612 | | 2001 | 6,622 | | 2000 | 6,623 | | 1999 | 6,548 | | 1998 | 6,438 | | 1997 | 6,327 | | 1996 | 6,257 | | 1995 | 6,275 | | 1994 | 6,378 | | 1993 | 6,565 | | 1992 | 6,849 | | 1991 | 7,178 | | 1990 | 7,509 | | 1989 | 7,821 | | 1988 | 8,098 | | 1987 | 8,336 | | 1986 | 8,540 | | 1985 | 8,721 | | 1984 | 8,871 | | 1983 | 8,974 | | 1982 | 9,029 | | 1981 | 9,038 | | 1980 | 9,000 | | 1979 | 8,922 | | 1978 | 8,821 | | 1977 | 8,700 | | 1976 | 8,538 | | 1975 | 8,335 | | 1974 | 8,101 | | 1973 | 7,827 | | 1972 | 7,531 | | 1971 | 7,260 | | 1970 | 7,047 | | 1969 | 6,889 | | 1968 | 6,791 | | 1967 | 6,752 | | 1966 | 6,742 | | 1965 | 6,738 | | 1964 | 6,744 | | 1963 | 6,769 | | 1962 | 6,803 | | 1961 | 6,835 | | 1960 | 6,860 |
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