| Year | Value | | 2022 | 8,432 | | 2021 | 8,501 | | 2020 | 8,566 | | 2019 | 8,669 | | 2018 | 8,805 | | 2017 | 8,938 | | 2016 | 9,062 | | 2015 | 9,182 | | 2014 | 9,300 | | 2013 | 9,415 | | 2012 | 9,523 | | 2011 | 9,628 | | 2010 | 9,731 | | 2009 | 9,862 | | 2008 | 10,022 | | 2007 | 10,179 | | 2006 | 10,330 | | 2005 | 10,473 | | 2004 | 10,604 | | 2003 | 10,726 | | 2002 | 10,836 | | 2001 | 10,930 | | 2000 | 11,007 | | 1999 | 11,173 | | 1998 | 11,362 | | 1997 | 11,555 | | 1996 | 11,744 | | 1995 | 11,925 | | 1994 | 12,099 | | 1993 | 12,268 | | 1992 | 12,427 | | 1991 | 12,581 | | 1990 | 12,726 | | 1989 | 12,216 | | 1988 | 11,506 | | 1987 | 10,818 | | 1986 | 10,168 | | 1985 | 9,551 | | 1984 | 8,967 | | 1983 | 8,410 | | 1982 | 7,879 | | 1981 | 7,370 | | 1980 | 6,890 | | 1979 | 7,829 | | 1978 | 9,476 | | 1977 | 11,422 | | 1976 | 13,680 | | 1975 | 16,283 | | 1974 | 19,221 | | 1973 | 22,471 | | 1972 | 25,989 | | 1971 | 29,728 | | 1970 | 33,625 | | 1969 | 34,801 | | 1968 | 35,092 | | 1967 | 35,329 | | 1966 | 35,522 | | 1965 | 35,675 | | 1964 | 35,792 | | 1963 | 35,883 | | 1962 | 35,961 | | 1961 | 36,028 | | 1960 | 36,081 |
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