| Year | Value | | 2022 | 9,964 | | 2021 | 10,150 | | 2020 | 10,272 | | 2019 | 10,288 | | 2018 | 10,265 | | 2017 | 10,248 | | 2016 | 10,211 | | 2015 | 10,158 | | 2014 | 10,056 | | 2013 | 9,851 | | 2012 | 9,716 | | 2011 | 9,666 | | 2010 | 9,677 | | 2009 | 9,735 | | 2008 | 9,814 | | 2007 | 9,879 | | 2006 | 9,909 | | 2005 | 9,798 | | 2004 | 9,625 | | 2003 | 9,487 | | 2002 | 9,315 | | 2001 | 9,139 | | 2000 | 8,967 | | 1999 | 8,795 | | 1998 | 8,612 | | 1997 | 8,386 | | 1996 | 8,118 | | 1995 | 7,818 | | 1994 | 7,468 | | 1993 | 7,084 | | 1992 | 6,713 | | 1991 | 6,359 | | 1990 | 6,022 | | 1989 | 5,720 | | 1988 | 5,495 | | 1987 | 5,342 | | 1986 | 5,220 | | 1985 | 5,121 | | 1984 | 5,051 | | 1983 | 4,981 | | 1982 | 4,890 | | 1981 | 4,782 | | 1980 | 4,673 | | 1979 | 4,585 | | 1978 | 4,504 | | 1977 | 4,409 | | 1976 | 4,328 | | 1975 | 4,288 | | 1974 | 4,240 | | 1973 | 4,157 | | 1972 | 4,058 | | 1971 | 3,868 | | 1970 | 3,590 | | 1969 | 3,292 | | 1968 | 3,107 | | 1967 | 3,002 | | 1966 | 2,909 | | 1965 | 2,819 | | 1964 | 2,748 | | 1963 | 2,675 | | 1962 | 2,603 | | 1961 | 2,529 | | 1960 | 2,453 |
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