| Year | Value | | 2022 | 10,468 | | 2021 | 9,986 | | 2020 | 9,612 | | 2019 | 9,143 | | 2018 | 8,821 | | 2017 | 8,641 | | 2016 | 8,457 | | 2015 | 8,278 | | 2014 | 8,121 | | 2013 | 7,996 | | 2012 | 7,893 | | 2011 | 7,790 | | 2010 | 7,676 | | 2009 | 7,559 | | 2008 | 7,449 | | 2007 | 7,344 | | 2006 | 7,236 | | 2005 | 7,117 | | 2004 | 6,973 | | 2003 | 6,801 | | 2002 | 6,620 | | 2001 | 6,474 | | 2000 | 6,394 | | 1999 | 6,372 | | 1998 | 6,408 | | 1997 | 6,469 | | 1996 | 6,478 | | 1995 | 6,381 | | 1994 | 6,190 | | 1993 | 5,922 | | 1992 | 5,583 | | 1991 | 5,229 | | 1990 | 4,912 | | 1989 | 4,618 | | 1988 | 4,332 | | 1987 | 4,058 | | 1986 | 3,793 | | 1985 | 3,532 | | 1984 | 3,290 | | 1983 | 3,082 | | 1982 | 2,906 | | 1981 | 2,760 | | 1980 | 2,653 | | 1979 | 2,597 | | 1978 | 2,600 | | 1977 | 2,650 | | 1976 | 2,702 | | 1975 | 2,713 | | 1974 | 2,669 | | 1973 | 2,562 | | 1972 | 2,410 | | 1971 | 2,272 | | 1970 | 2,191 | | 1969 | 2,166 | | 1968 | 2,199 | | 1967 | 2,277 | | 1966 | 2,362 | | 1965 | 2,421 | | 1964 | 2,452 | | 1963 | 2,464 | | 1962 | 2,458 | | 1961 | 2,441 | | 1960 | 2,421 |
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