| Year | Value | | 2022 | 6,190 | | 2021 | 6,075 | | 2020 | 5,925 | | 2019 | 5,798 | | 2018 | 5,718 | | 2017 | 5,637 | | 2016 | 5,510 | | 2015 | 5,373 | | 2014 | 5,250 | | 2013 | 5,118 | | 2012 | 4,972 | | 2011 | 4,850 | | 2010 | 4,786 | | 2009 | 4,758 | | 2008 | 4,764 | | 2007 | 4,855 | | 2006 | 4,969 | | 2005 | 4,965 | | 2004 | 4,845 | | 2003 | 4,656 | | 2002 | 4,367 | | 2001 | 4,033 | | 2000 | 3,816 | | 1999 | 3,752 | | 1998 | 3,756 | | 1997 | 3,793 | | 1996 | 3,857 | | 1995 | 3,898 | | 1994 | 3,875 | | 1993 | 3,812 | | 1992 | 3,735 | | 1991 | 3,646 | | 1990 | 3,561 | | 1989 | 3,496 | | 1988 | 3,435 | | 1987 | 3,383 | | 1986 | 3,375 | | 1985 | 3,378 | | 1984 | 3,378 | | 1983 | 3,393 | | 1982 | 3,406 | | 1981 | 3,397 | | 1980 | 3,376 | | 1979 | 3,307 | | 1978 | 3,156 | | 1977 | 2,983 | | 1976 | 2,877 | | 1975 | 2,908 | | 1974 | 3,043 | | 1973 | 3,213 | | 1972 | 3,390 | | 1971 | 3,542 | | 1970 | 3,644 | | 1969 | 3,695 | | 1968 | 3,713 | | 1967 | 3,704 | | 1966 | 3,668 | | 1965 | 3,620 | | 1964 | 3,561 | | 1963 | 3,497 | | 1962 | 3,429 | | 1961 | 3,350 | | 1960 | 3,269 |
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