| Year | Value | | 2022 | 4,888 | | 2021 | 4,938 | | 2020 | 4,977 | | 2019 | 5,007 | | 2018 | 5,026 | | 2017 | 5,032 | | 2016 | 5,024 | | 2015 | 5,005 | | 2014 | 4,973 | | 2013 | 4,925 | | 2012 | 4,861 | | 2011 | 4,781 | | 2010 | 4,708 | | 2009 | 4,647 | | 2008 | 4,588 | | 2007 | 4,542 | | 2006 | 4,511 | | 2005 | 4,543 | | 2004 | 4,636 | | 2003 | 4,738 | | 2002 | 4,882 | | 2001 | 5,048 | | 2000 | 5,153 | | 1999 | 5,238 | | 1998 | 5,375 | | 1997 | 5,563 | | 1996 | 5,797 | | 1995 | 6,048 | | 1994 | 6,296 | | 1993 | 6,495 | | 1992 | 6,667 | | 1991 | 6,816 | | 1990 | 6,906 | | 1989 | 6,915 | | 1988 | 6,895 | | 1987 | 6,798 | | 1986 | 6,551 | | 1985 | 6,344 | | 1984 | 6,189 | | 1983 | 6,006 | | 1982 | 5,875 | | 1981 | 5,868 | | 1980 | 5,909 | | 1979 | 5,963 | | 1978 | 6,036 | | 1977 | 6,091 | | 1976 | 6,130 | | 1975 | 6,163 | | 1974 | 6,193 | | 1973 | 6,234 | | 1972 | 6,336 | | 1971 | 6,533 | | 1970 | 6,816 | | 1969 | 7,165 | | 1968 | 7,537 | | 1967 | 7,884 | | 1966 | 8,198 | | 1965 | 8,505 | | 1964 | 8,805 | | 1963 | 9,071 | | 1962 | 9,269 | | 1961 | 9,363 | | 1960 | 9,292 |
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