| Year | Value | | 2022 | 2,728 | | 2021 | 2,696 | | 2020 | 2,679 | | 2019 | 2,688 | | 2018 | 2,728 | | 2017 | 2,785 | | 2016 | 2,859 | | 2015 | 2,940 | | 2014 | 3,051 | | 2013 | 3,210 | | 2012 | 3,318 | | 2011 | 3,349 | | 2010 | 3,352 | | 2009 | 3,312 | | 2008 | 3,239 | | 2007 | 3,210 | | 2006 | 3,243 | | 2005 | 3,325 | | 2004 | 3,396 | | 2003 | 3,431 | | 2002 | 3,489 | | 2001 | 3,549 | | 2000 | 3,564 | | 1999 | 3,568 | | 1998 | 3,563 | | 1997 | 3,507 | | 1996 | 3,407 | | 1995 | 3,308 | | 1994 | 3,249 | | 1993 | 3,218 | | 1992 | 3,201 | | 1991 | 3,211 | | 1990 | 3,221 | | 1989 | 3,216 | | 1988 | 3,235 | | 1987 | 3,271 | | 1986 | 3,304 | | 1985 | 3,340 | | 1984 | 3,415 | | 1983 | 3,486 | | 1982 | 3,545 | | 1981 | 3,605 | | 1980 | 3,613 | | 1979 | 3,562 | | 1978 | 3,523 | | 1977 | 3,517 | | 1976 | 3,538 | | 1975 | 3,617 | | 1974 | 3,787 | | 1973 | 4,019 | | 1972 | 4,250 | | 1971 | 4,476 | | 1970 | 4,681 | | 1969 | 4,768 | | 1968 | 4,756 | | 1967 | 4,751 | | 1966 | 4,738 | | 1965 | 4,694 | | 1964 | 4,593 | | 1963 | 4,493 | | 1962 | 4,431 | | 1961 | 4,371 | | 1960 | 4,303 |
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