| Year | Value | | 2022 | 4,199 | | 2021 | 4,168 | | 2020 | 4,217 | | 2019 | 4,269 | | 2018 | 4,460 | | 2017 | 4,826 | | 2016 | 5,044 | | 2015 | 5,137 | | 2014 | 5,192 | | 2013 | 5,242 | | 2012 | 5,319 | | 2011 | 5,430 | | 2010 | 5,515 | | 2009 | 5,565 | | 2008 | 5,578 | | 2007 | 5,497 | | 2006 | 5,348 | | 2005 | 5,181 | | 2004 | 5,077 | | 2003 | 5,066 | | 2002 | 5,054 | | 2001 | 5,159 | | 2000 | 5,477 | | 1999 | 5,843 | | 1998 | 6,220 | | 1997 | 6,522 | | 1996 | 6,704 | | 1995 | 6,859 | | 1994 | 7,030 | | 1993 | 7,187 | | 1992 | 7,304 | | 1991 | 7,422 | | 1990 | 7,531 | | 1989 | 7,636 | | 1988 | 7,756 | | 1987 | 7,852 | | 1986 | 7,885 | | 1985 | 7,850 | | 1984 | 7,773 | | 1983 | 7,700 | | 1982 | 7,624 | | 1981 | 7,546 | | 1980 | 7,536 | | 1979 | 7,570 | | 1978 | 7,669 | | 1977 | 7,836 | | 1976 | 7,969 | | 1975 | 8,128 | | 1974 | 8,317 | | 1973 | 8,522 | | 1972 | 8,892 | | 1971 | 9,223 | | 1970 | 9,396 | | 1969 | 9,550 | | 1968 | 9,652 | | 1967 | 9,731 | | 1966 | 9,834 | | 1965 | 9,914 | | 1964 | 10,007 | | 1963 | 10,147 | | 1962 | 10,229 | | 1961 | 10,275 | | 1960 | 10,318 |
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