| Year | Value | | 2022 | 11,312 | | 2021 | 11,204 | | 2020 | 11,069 | | 2019 | 10,956 | | 2018 | 10,865 | | 2017 | 10,828 | | 2016 | 10,852 | | 2015 | 10,877 | | 2014 | 10,899 | | 2013 | 10,918 | | 2012 | 10,854 | | 2011 | 10,700 | | 2010 | 10,550 | | 2009 | 10,408 | | 2008 | 10,272 | | 2007 | 10,149 | | 2006 | 10,030 | | 2005 | 9,912 | | 2004 | 9,791 | | 2003 | 9,668 | | 2002 | 9,609 | | 2001 | 9,621 | | 2000 | 9,638 | | 1999 | 9,640 | | 1998 | 9,634 | | 1997 | 9,630 | | 1996 | 9,611 | | 1995 | 9,585 | | 1994 | 9,559 | | 1993 | 9,517 | | 1992 | 9,466 | | 1991 | 9,354 | | 1990 | 9,182 | | 1989 | 9,017 | | 1988 | 8,844 | | 1987 | 8,665 | | 1986 | 8,496 | | 1985 | 8,329 | | 1984 | 8,197 | | 1983 | 8,099 | | 1982 | 7,993 | | 1981 | 7,874 | | 1980 | 7,731 | | 1979 | 7,552 | | 1978 | 7,297 | | 1977 | 6,984 | | 1976 | 6,677 | | 1975 | 6,381 | | 1974 | 6,100 | | 1973 | 5,934 | | 1972 | 5,891 | | 1971 | 5,854 | | 1970 | 5,814 | | 1969 | 5,779 | | 1968 | 5,729 | | 1967 | 5,657 | | 1966 | 5,591 | | 1965 | 5,548 | | 1964 | 5,525 | | 1963 | 5,503 | | 1962 | 5,471 | | 1961 | 5,436 | | 1960 | 5,404 |
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