| Year | Value | | 2022 | 9,680 | | 2021 | 9,614 | | 2020 | 9,528 | | 2019 | 9,428 | | 2018 | 9,341 | | 2017 | 9,234 | | 2016 | 9,093 | | 2015 | 8,908 | | 2014 | 8,663 | | 2013 | 8,377 | | 2012 | 8,096 | | 2011 | 7,814 | | 2010 | 7,532 | | 2009 | 7,261 | | 2008 | 6,976 | | 2007 | 6,624 | | 2006 | 6,233 | | 2005 | 5,863 | | 2004 | 5,524 | | 2003 | 5,236 | | 2002 | 4,998 | | 2001 | 4,810 | | 2000 | 4,673 | | 1999 | 4,565 | | 1998 | 4,449 | | 1997 | 4,332 | | 1996 | 4,222 | | 1995 | 4,106 | | 1994 | 3,987 | | 1993 | 3,865 | | 1992 | 3,738 | | 1991 | 3,606 | | 1990 | 3,463 | | 1989 | 3,307 | | 1988 | 3,153 | | 1987 | 3,009 | | 1986 | 2,868 | | 1985 | 2,739 | | 1984 | 2,633 | | 1983 | 2,531 | | 1982 | 2,431 | | 1981 | 2,356 | | 1980 | 2,304 | | 1979 | 2,255 | | 1978 | 2,192 | | 1977 | 2,122 | | 1976 | 2,030 | | 1975 | 1,900 | | 1974 | 1,757 | | 1973 | 1,626 | | 1972 | 1,526 | | 1971 | 1,481 | | 1970 | 1,491 | | 1969 | 1,529 | | 1968 | 1,573 | | 1967 | 1,609 | | 1966 | 1,614 | | 1965 | 1,582 | | 1964 | 1,523 | | 1963 | 1,451 | | 1962 | 1,374 | | 1961 | 1,312 | | 1960 | 1,266 |
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