| Year | Value | | 2022 | 10,542 | | 2021 | 10,690 | | 2020 | 10,666 | | 2019 | 10,450 | | 2018 | 10,188 | | 2017 | 9,883 | | 2016 | 9,513 | | 2015 | 9,120 | | 2014 | 8,733 | | 2013 | 8,365 | | 2012 | 8,024 | | 2011 | 7,730 | | 2010 | 7,481 | | 2009 | 7,262 | | 2008 | 7,062 | | 2007 | 6,885 | | 2006 | 6,720 | | 2005 | 6,562 | | 2004 | 6,434 | | 2003 | 6,349 | | 2002 | 6,296 | | 2001 | 6,252 | | 2000 | 6,201 | | 1999 | 6,142 | | 1998 | 6,047 | | 1997 | 5,909 | | 1996 | 5,770 | | 1995 | 5,640 | | 1994 | 5,503 | | 1993 | 5,383 | | 1992 | 5,291 | | 1991 | 5,203 | | 1990 | 5,114 | | 1989 | 5,035 | | 1988 | 4,976 | | 1987 | 4,937 | | 1986 | 4,906 | | 1985 | 4,869 | | 1984 | 4,820 | | 1983 | 4,765 | | 1982 | 4,704 | | 1981 | 4,645 | | 1980 | 4,596 | | 1979 | 4,554 | | 1978 | 4,521 | | 1977 | 4,496 | | 1976 | 4,464 | | 1975 | 4,417 | | 1974 | 4,355 | | 1973 | 4,277 | | 1972 | 4,184 | | 1971 | 4,078 | | 1970 | 3,961 | | 1969 | 3,830 | | 1968 | 3,680 | | 1967 | 3,523 | | 1966 | 3,391 | | 1965 | 3,303 | | 1964 | 3,263 | | 1963 | 3,278 | | 1962 | 3,336 | | 1961 | 3,385 | | 1960 | 3,393 |
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