| Year | Value | | 2022 | 11,552 | | 2021 | 11,759 | | 2020 | 12,065 | | 2019 | 12,370 | | 2018 | 12,646 | | 2017 | 12,866 | | 2016 | 13,015 | | 2015 | 13,086 | | 2014 | 13,056 | | 2013 | 12,949 | | 2012 | 12,763 | | 2011 | 12,423 | | 2010 | 11,750 | | 2009 | 10,776 | | 2008 | 9,802 | | 2007 | 8,884 | | 2006 | 7,934 | | 2005 | 6,969 | | 2004 | 6,212 | | 2003 | 5,866 | | 2002 | 5,818 | | 2001 | 5,863 | | 2000 | 5,906 | | 1999 | 5,903 | | 1998 | 5,800 | | 1997 | 5,597 | | 1996 | 5,345 | | 1995 | 5,076 | | 1994 | 4,806 | | 1993 | 4,549 | | 1992 | 4,313 | | 1991 | 4,095 | | 1990 | 3,957 | | 1989 | 3,920 | | 1988 | 3,953 | | 1987 | 4,030 | | 1986 | 4,112 | | 1985 | 4,177 | | 1984 | 4,204 | | 1983 | 4,188 | | 1982 | 4,126 | | 1981 | 4,022 | | 1980 | 3,847 | | 1979 | 3,669 | | 1978 | 3,577 | | 1977 | 3,547 | | 1976 | 3,564 | | 1975 | 3,610 | | 1974 | 3,616 | | 1973 | 3,555 | | 1972 | 3,474 | | 1971 | 3,383 | | 1970 | 3,279 | | 1969 | 3,163 | | 1968 | 3,034 | | 1967 | 2,895 | | 1966 | 2,753 | | 1965 | 2,610 | | 1964 | 2,463 | | 1963 | 2,307 | | 1962 | 2,158 | | 1961 | 2,052 | | 1960 | 2,018 |
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