| Year | Value | | 2022 | 10,224 | | 2021 | 9,705 | | 2020 | 9,213 | | 2019 | 8,855 | | 2018 | 8,674 | | 2017 | 8,556 | | 2016 | 8,489 | | 2015 | 8,460 | | 2014 | 8,460 | | 2013 | 8,486 | | 2012 | 8,526 | | 2011 | 8,503 | | 2010 | 8,442 | | 2009 | 8,422 | | 2008 | 8,434 | | 2007 | 8,463 | | 2006 | 8,472 | | 2005 | 8,424 | | 2004 | 8,299 | | 2003 | 8,091 | | 2002 | 7,801 | | 2001 | 7,457 | | 2000 | 7,090 | | 1999 | 6,723 | | 1998 | 6,391 | | 1997 | 6,110 | | 1996 | 5,878 | | 1995 | 5,684 | | 1994 | 5,595 | | 1993 | 5,604 | | 1992 | 5,624 | | 1991 | 5,642 | | 1990 | 5,630 | | 1989 | 5,481 | | 1988 | 5,219 | | 1987 | 4,964 | | 1986 | 4,743 | | 1985 | 4,556 | | 1984 | 4,402 | | 1983 | 4,287 | | 1982 | 4,194 | | 1981 | 4,130 | | 1980 | 4,082 | | 1979 | 4,009 | | 1978 | 3,903 | | 1977 | 3,772 | | 1976 | 3,635 | | 1975 | 3,500 | | 1974 | 3,373 | | 1973 | 3,264 | | 1972 | 3,169 | | 1971 | 3,080 | | 1970 | 2,957 | | 1969 | 2,747 | | 1968 | 2,492 | | 1967 | 2,267 | | 1966 | 2,108 | | 1965 | 2,054 | | 1964 | 2,128 | | 1963 | 2,327 | | 1962 | 2,622 | | 1961 | 2,962 | | 1960 | 3,141 |
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