| Year | Value | | 2022 | 10,378 | | 2021 | 10,364 | | 2020 | 10,272 | | 2019 | 10,091 | | 2018 | 9,869 | | 2017 | 9,700 | | 2016 | 9,583 | | 2015 | 9,512 | | 2014 | 9,460 | | 2013 | 9,339 | | 2012 | 9,150 | | 2011 | 8,943 | | 2010 | 8,689 | | 2009 | 8,397 | | 2008 | 8,172 | | 2007 | 8,047 | | 2006 | 7,939 | | 2005 | 7,815 | | 2004 | 7,682 | | 2003 | 7,542 | | 2002 | 7,381 | | 2001 | 7,177 | | 2000 | 6,925 | | 1999 | 6,635 | | 1998 | 6,314 | | 1997 | 6,027 | | 1996 | 5,778 | | 1995 | 5,512 | | 1994 | 5,374 | | 1993 | 5,244 | | 1992 | 4,958 | | 1991 | 4,652 | | 1990 | 4,378 | | 1989 | 4,188 | | 1988 | 4,009 | | 1987 | 3,832 | | 1986 | 3,729 | | 1985 | 3,650 | | 1984 | 3,621 | | 1983 | 3,641 | | 1982 | 3,666 | | 1981 | 3,714 | | 1980 | 3,742 | | 1979 | 3,714 | | 1978 | 3,674 | | 1977 | 3,632 | | 1976 | 3,584 | | 1975 | 3,531 | | 1974 | 3,489 | | 1973 | 3,457 | | 1972 | 3,431 | | 1971 | 3,402 | | 1970 | 3,362 | | 1969 | 3,310 | | 1968 | 3,248 | | 1967 | 3,176 | | 1966 | 3,102 | | 1965 | 3,034 | | 1964 | 2,973 | | 1963 | 2,922 | | 1962 | 2,880 | | 1961 | 2,841 | | 1960 | 2,795 |
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