| Year | Value | | 2022 | 3,249 | | 2021 | 3,299 | | 2020 | 3,324 | | 2019 | 3,319 | | 2018 | 3,287 | | 2017 | 3,225 | | 2016 | 3,126 | | 2015 | 2,989 | | 2014 | 2,833 | | 2013 | 2,672 | | 2012 | 2,512 | | 2011 | 2,370 | | 2010 | 2,252 | | 2009 | 2,150 | | 2008 | 2,056 | | 2007 | 1,968 | | 2006 | 1,883 | | 2005 | 1,790 | | 2004 | 1,696 | | 2003 | 1,609 | | 2002 | 1,538 | | 2001 | 1,502 | | 2000 | 1,511 | | 1999 | 1,543 | | 1998 | 1,579 | | 1997 | 1,606 | | 1996 | 1,614 | | 1995 | 1,601 | | 1994 | 1,577 | | 1993 | 1,550 | | 1992 | 1,520 | | 1991 | 1,499 | | 1990 | 1,514 | | 1989 | 1,552 | | 1988 | 1,588 | | 1987 | 1,623 | | 1986 | 1,646 | | 1985 | 1,653 | | 1984 | 1,649 | | 1983 | 1,633 | | 1982 | 1,606 | | 1981 | 1,581 | | 1980 | 1,565 | | 1979 | 1,556 | | 1978 | 1,550 | | 1977 | 1,551 | | 1976 | 1,555 | | 1975 | 1,557 | | 1974 | 1,556 | | 1973 | 1,553 | | 1972 | 1,548 | | 1971 | 1,546 | | 1970 | 1,557 | | 1969 | 1,592 | | 1968 | 1,643 | | 1967 | 1,691 | | 1966 | 1,723 | | 1965 | 1,731 | | 1964 | 1,721 | | 1963 | 1,694 | | 1962 | 1,658 | | 1961 | 1,625 | | 1960 | 1,592 |
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