| Year | Value | | 2022 | 5,224 | | 2021 | 5,083 | | 2020 | 4,988 | | 2019 | 4,918 | | 2018 | 4,898 | | 2017 | 4,886 | | 2016 | 4,795 | | 2015 | 4,705 | | 2014 | 4,712 | | 2013 | 4,727 | | 2012 | 4,731 | | 2011 | 4,765 | | 2010 | 4,742 | | 2009 | 4,621 | | 2008 | 4,456 | | 2007 | 4,191 | | 2006 | 3,856 | | 2005 | 3,657 | | 2004 | 3,588 | | 2003 | 3,539 | | 2002 | 3,544 | | 2001 | 3,586 | | 2000 | 3,581 | | 1999 | 3,530 | | 1998 | 3,482 | | 1997 | 3,434 | | 1996 | 3,386 | | 1995 | 3,372 | | 1994 | 3,390 | | 1993 | 3,423 | | 1992 | 3,452 | | 1991 | 3,464 | | 1990 | 3,463 | | 1989 | 3,469 | | 1988 | 3,495 | | 1987 | 3,522 | | 1986 | 3,549 | | 1985 | 3,585 | | 1984 | 3,606 | | 1983 | 3,583 | | 1982 | 3,519 | | 1981 | 3,421 | | 1980 | 3,319 | | 1979 | 3,304 | | 1978 | 3,419 | | 1977 | 3,608 | | 1976 | 3,787 | | 1975 | 3,871 | | 1974 | 3,874 | | 1973 | 3,854 | | 1972 | 3,826 | | 1971 | 3,805 | | 1970 | 3,795 | | 1969 | 3,774 | | 1968 | 3,718 | | 1967 | 3,645 | | 1966 | 3,588 | | 1965 | 3,543 | | 1964 | 3,504 | | 1963 | 3,461 | | 1962 | 3,426 | | 1961 | 3,408 | | 1960 | 3,400 |
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