| Year | Value | | 2022 | 4,392 | | 2021 | 4,482 | | 2020 | 4,566 | | 2019 | 4,633 | | 2018 | 4,687 | | 2017 | 4,739 | | 2016 | 4,785 | | 2015 | 4,817 | | 2014 | 4,817 | | 2013 | 4,782 | | 2012 | 4,716 | | 2011 | 4,615 | | 2010 | 4,487 | | 2009 | 4,339 | | 2008 | 4,173 | | 2007 | 3,997 | | 2006 | 3,829 | | 2005 | 3,662 | | 2004 | 3,476 | | 2003 | 3,303 | | 2002 | 3,145 | | 2001 | 2,978 | | 2000 | 2,818 | | 1999 | 2,691 | | 1998 | 2,575 | | 1997 | 2,435 | | 1996 | 2,300 | | 1995 | 2,193 | | 1994 | 2,102 | | 1993 | 2,026 | | 1992 | 1,990 | | 1991 | 1,928 | | 1990 | 1,830 | | 1989 | 1,759 | | 1988 | 1,729 | | 1987 | 1,711 | | 1986 | 1,670 | | 1985 | 1,616 | | 1984 | 1,565 | | 1983 | 1,509 | | 1982 | 1,440 | | 1981 | 1,351 | | 1980 | 1,246 | | 1979 | 1,154 | | 1978 | 1,089 | | 1977 | 1,052 | | 1976 | 1,034 | | 1975 | 1,021 | | 1974 | 1,008 | | 1973 | 1,002 | | 1972 | 1,011 | | 1971 | 1,038 | | 1970 | 1,077 | | 1969 | 1,120 | | 1968 | 1,163 | | 1967 | 1,191 | | 1966 | 1,205 | | 1965 | 1,213 | | 1964 | 1,220 | | 1963 | 1,225 | | 1962 | 1,223 | | 1961 | 1,204 | | 1960 | 1,158 |
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