| Year | Value | | 2022 | 4,485 | | 2021 | 4,583 | | 2020 | 4,677 | | 2019 | 4,752 | | 2018 | 4,807 | | 2017 | 4,865 | | 2016 | 4,931 | | 2015 | 5,008 | | 2014 | 5,122 | | 2013 | 5,265 | | 2012 | 5,430 | | 2011 | 5,557 | | 2010 | 5,535 | | 2009 | 5,477 | | 2008 | 5,493 | | 2007 | 5,537 | | 2006 | 5,609 | | 2005 | 5,688 | | 2004 | 5,767 | | 2003 | 5,873 | | 2002 | 5,938 | | 2001 | 6,095 | | 2000 | 6,439 | | 1999 | 6,763 | | 1998 | 7,008 | | 1997 | 7,074 | | 1996 | 6,940 | | 1995 | 6,742 | | 1994 | 6,546 | | 1993 | 6,350 | | 1992 | 6,147 | | 1991 | 5,981 | | 1990 | 5,845 | | 1989 | 5,742 | | 1988 | 5,691 | | 1987 | 5,670 | | 1986 | 5,652 | | 1985 | 5,617 | | 1984 | 5,556 | | 1983 | 5,471 | | 1982 | 5,330 | | 1981 | 5,132 | | 1980 | 4,930 | | 1979 | 4,729 | | 1978 | 4,574 | | 1977 | 4,480 | | 1976 | 4,403 | | 1975 | 4,371 | | 1974 | 4,353 | | 1973 | 4,322 | | 1972 | 4,356 | | 1971 | 4,332 | | 1970 | 4,211 | | 1969 | 4,095 | | 1968 | 3,975 | | 1967 | 3,875 | | 1966 | 3,808 | | 1965 | 3,751 | | 1964 | 3,686 | | 1963 | 3,626 | | 1962 | 3,572 | | 1961 | 3,535 | | 1960 | 3,536 |
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