| Year | Value | | 2022 | 13,537 | | 2021 | 13,194 | | 2020 | 12,814 | | 2019 | 12,431 | | 2018 | 12,094 | | 2017 | 11,749 | | 2016 | 11,401 | | 2015 | 11,092 | | 2014 | 10,829 | | 2013 | 10,620 | | 2012 | 10,452 | | 2011 | 10,305 | | 2010 | 10,172 | | 2009 | 10,048 | | 2008 | 9,917 | | 2007 | 9,782 | | 2006 | 9,663 | | 2005 | 9,563 | | 2004 | 9,475 | | 2003 | 9,390 | | 2002 | 9,312 | | 2001 | 9,242 | | 2000 | 9,175 | | 1999 | 9,112 | | 1998 | 9,053 | | 1997 | 8,996 | | 1996 | 8,941 | | 1995 | 8,884 | | 1994 | 8,826 | | 1993 | 8,763 | | 1992 | 8,700 | | 1991 | 8,636 | | 1990 | 8,571 | | 1989 | 8,503 | | 1988 | 8,432 | | 1987 | 8,358 | | 1986 | 8,281 | | 1985 | 8,204 | | 1984 | 8,127 | | 1983 | 8,049 | | 1982 | 7,970 | | 1981 | 7,889 | | 1980 | 7,807 | | 1979 | 7,724 | | 1978 | 7,642 | | 1977 | 7,564 | | 1976 | 7,488 | | 1975 | 7,412 | | 1974 | 7,340 | | 1973 | 7,269 | | 1972 | 7,199 | | 1971 | 7,130 | | 1970 | 7,058 | | 1969 | 6,985 | | 1968 | 6,913 | | 1967 | 6,842 | | 1966 | 6,770 | | 1965 | 6,696 | | 1964 | 6,622 | | 1963 | 6,550 | | 1962 | 6,479 | | 1961 | 6,408 | | 1960 | 6,339 |
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