| Year | Value | | 2022 | 5,507 | | 2021 | 5,502 | | 2020 | 5,506 | | 2019 | 5,526 | | 2018 | 5,564 | | 2017 | 5,609 | | 2016 | 5,661 | | 2015 | 5,728 | | 2014 | 5,828 | | 2013 | 5,936 | | 2012 | 6,013 | | 2011 | 6,089 | | 2010 | 6,210 | | 2009 | 6,300 | | 2008 | 6,375 | | 2007 | 6,507 | | 2006 | 6,660 | | 2005 | 6,846 | | 2004 | 7,047 | | 2003 | 7,260 | | 2002 | 7,467 | | 2001 | 7,571 | | 2000 | 7,577 | | 1999 | 7,622 | | 1998 | 7,707 | | 1997 | 7,788 | | 1996 | 7,894 | | 1995 | 7,987 | | 1994 | 7,981 | | 1993 | 7,880 | | 1992 | 7,785 | | 1991 | 7,729 | | 1990 | 7,689 | | 1989 | 7,647 | | 1988 | 7,595 | | 1987 | 7,524 | | 1986 | 7,434 | | 1985 | 7,330 | | 1984 | 7,213 | | 1983 | 7,085 | | 1982 | 6,946 | | 1981 | 6,797 | | 1980 | 6,636 | | 1979 | 6,463 | | 1978 | 6,291 | | 1977 | 6,158 | | 1976 | 6,069 | | 1975 | 5,997 | | 1974 | 5,898 | | 1973 | 5,762 | | 1972 | 5,613 | | 1971 | 5,450 | | 1970 | 5,277 | | 1969 | 5,107 | | 1968 | 4,949 | | 1967 | 4,796 | | 1966 | 4,648 | | 1965 | 4,505 | | 1964 | 4,365 | | 1963 | 4,227 | | 1962 | 4,089 | | 1961 | 3,952 | | 1960 | 3,818 |
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