| Year | Value | | 2022 | 6,586 | | 2021 | 6,562 | | 2020 | 6,475 | | 2019 | 6,326 | | 2018 | 6,159 | | 2017 | 6,014 | | 2016 | 5,891 | | 2015 | 5,794 | | 2014 | 5,719 | | 2013 | 5,668 | | 2012 | 5,633 | | 2011 | 5,600 | | 2010 | 5,575 | | 2009 | 5,555 | | 2008 | 5,534 | | 2007 | 5,517 | | 2006 | 5,512 | | 2005 | 5,521 | | 2004 | 5,547 | | 2003 | 5,596 | | 2002 | 5,559 | | 2001 | 5,407 | | 2000 | 5,233 | | 1999 | 5,037 | | 1998 | 4,819 | | 1997 | 4,593 | | 1996 | 4,388 | | 1995 | 4,221 | | 1994 | 4,121 | | 1993 | 4,096 | | 1992 | 4,060 | | 1991 | 3,957 | | 1990 | 3,830 | | 1989 | 3,706 | | 1988 | 3,585 | | 1987 | 3,469 | | 1986 | 3,362 | | 1985 | 3,265 | | 1984 | 3,177 | | 1983 | 3,040 | | 1982 | 2,858 | | 1981 | 2,685 | | 1980 | 2,510 | | 1979 | 2,332 | | 1978 | 2,158 | | 1977 | 1,990 | | 1976 | 1,832 | | 1975 | 1,684 | | 1974 | 1,543 | | 1973 | 1,450 | | 1972 | 1,403 | | 1971 | 1,358 | | 1970 | 1,315 | | 1969 | 1,273 | | 1968 | 1,234 | | 1967 | 1,195 | | 1966 | 1,158 | | 1965 | 1,121 | | 1964 | 1,084 | | 1963 | 1,049 | | 1962 | 1,014 | | 1961 | 980 | | 1960 | 946 |
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