| Year | Value | | 2022 | 6,954 | | 2021 | 7,078 | | 2020 | 7,169 | | 2019 | 7,280 | | 2018 | 7,386 | | 2017 | 7,542 | | 2016 | 7,683 | | 2015 | 7,816 | | 2014 | 7,987 | | 2013 | 8,161 | | 2012 | 8,408 | | 2011 | 8,673 | | 2010 | 8,887 | | 2009 | 8,963 | | 2008 | 9,132 | | 2007 | 9,342 | | 2006 | 9,554 | | 2005 | 9,760 | | 2004 | 9,914 | | 2003 | 10,026 | | 2002 | 10,136 | | 2001 | 10,228 | | 2000 | 10,341 | | 1999 | 10,392 | | 1998 | 10,462 | | 1997 | 10,513 | | 1996 | 10,565 | | 1995 | 10,657 | | 1994 | 10,710 | | 1993 | 10,762 | | 1992 | 10,894 | | 1991 | 11,082 | | 1990 | 11,288 | | 1989 | 11,414 | | 1988 | 11,499 | | 1987 | 11,541 | | 1986 | 11,600 | | 1985 | 11,725 | | 1984 | 11,804 | | 1983 | 11,860 | | 1982 | 11,912 | | 1981 | 11,987 | | 1980 | 11,987 | | 1979 | 12,033 | | 1978 | 12,125 | | 1977 | 12,367 | | 1976 | 12,611 | | 1975 | 12,703 | | 1974 | 12,795 | | 1973 | 12,782 | | 1972 | 12,715 | | 1971 | 12,540 | | 1970 | 12,647 | | 1969 | 12,805 | | 1968 | 12,939 | | 1967 | 13,051 | | 1966 | 13,166 | | 1965 | 13,308 | | 1964 | 13,335 | | 1963 | 13,474 | | 1962 | 13,508 | | 1961 | 13,545 | | 1960 | 13,476 |
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