| Year | Value | | 2022 | 3,785 | | 2021 | 3,829 | | 2020 | 3,913 | | 2019 | 4,024 | | 2018 | 4,146 | | 2017 | 4,266 | | 2016 | 4,403 | | 2015 | 4,563 | | 2014 | 4,730 | | 2013 | 4,911 | | 2012 | 5,086 | | 2011 | 5,220 | | 2010 | 5,295 | | 2009 | 5,325 | | 2008 | 5,337 | | 2007 | 5,342 | | 2006 | 5,380 | | 2005 | 5,475 | | 2004 | 5,609 | | 2003 | 5,760 | | 2002 | 5,916 | | 2001 | 6,069 | | 2000 | 6,205 | | 1999 | 6,302 | | 1998 | 6,378 | | 1997 | 6,452 | | 1996 | 6,524 | | 1995 | 6,593 | | 1994 | 6,650 | | 1993 | 6,676 | | 1992 | 6,667 | | 1991 | 6,630 | | 1990 | 6,566 | | 1989 | 6,513 | | 1988 | 6,518 | | 1987 | 6,573 | | 1986 | 6,665 | | 1985 | 6,773 | | 1984 | 6,873 | | 1983 | 6,948 | | 1982 | 6,995 | | 1981 | 7,023 | | 1980 | 7,063 | | 1979 | 7,095 | | 1978 | 7,067 | | 1977 | 6,967 | | 1976 | 6,799 | | 1975 | 6,582 | | 1974 | 6,353 | | 1973 | 6,148 | | 1972 | 5,973 | | 1971 | 5,822 | | 1970 | 5,692 | | 1969 | 5,584 | | 1968 | 5,453 | | 1967 | 5,290 | | 1966 | 5,106 | | 1965 | 4,882 | | 1964 | 4,626 | | 1963 | 4,397 | | 1962 | 4,206 | | 1961 | 4,039 | | 1960 | 3,925 |
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