| Year | Value | | 2022 | 8,334 | | 2021 | 8,269 | | 2020 | 8,087 | | 2019 | 7,843 | | 2018 | 7,597 | | 2017 | 7,345 | | 2016 | 7,074 | | 2015 | 6,853 | | 2014 | 6,728 | | 2013 | 6,656 | | 2012 | 6,621 | | 2011 | 6,616 | | 2010 | 6,647 | | 2009 | 6,714 | | 2008 | 6,808 | | 2007 | 6,924 | | 2006 | 7,077 | | 2005 | 7,273 | | 2004 | 7,473 | | 2003 | 7,643 | | 2002 | 7,763 | | 2001 | 7,859 | | 2000 | 7,902 | | 1999 | 7,864 | | 1998 | 7,785 | | 1997 | 7,684 | | 1996 | 7,578 | | 1995 | 7,474 | | 1994 | 7,364 | | 1993 | 7,246 | | 1992 | 7,132 | | 1991 | 7,026 | | 1990 | 6,943 | | 1989 | 6,849 | | 1988 | 6,702 | | 1987 | 6,518 | | 1986 | 6,381 | | 1985 | 6,275 | | 1984 | 6,095 | | 1983 | 5,833 | | 1982 | 5,511 | | 1981 | 5,223 | | 1980 | 4,990 | | 1979 | 4,752 | | 1978 | 4,510 | | 1977 | 4,279 | | 1976 | 4,190 | | 1975 | 4,197 | | 1974 | 4,102 | | 1973 | 3,921 | | 1972 | 3,780 | | 1971 | 3,740 | | 1970 | 3,776 | | 1969 | 3,861 | | 1968 | 3,952 | | 1967 | 4,004 | | 1966 | 3,980 | | 1965 | 3,886 | | 1964 | 3,766 | | 1963 | 3,668 | | 1962 | 3,609 | | 1961 | 3,574 | | 1960 | 3,555 |
|