| Year | Value | | 2022 | 7,213 | | 2021 | 7,427 | | 2020 | 7,620 | | 2019 | 7,784 | | 2018 | 7,937 | | 2017 | 8,049 | | 2016 | 8,074 | | 2015 | 8,005 | | 2014 | 7,880 | | 2013 | 7,751 | | 2012 | 7,629 | | 2011 | 7,508 | | 2010 | 7,401 | | 2009 | 7,405 | | 2008 | 7,521 | | 2007 | 7,637 | | 2006 | 7,703 | | 2005 | 7,682 | | 2004 | 7,568 | | 2003 | 7,395 | | 2002 | 7,218 | | 2001 | 7,111 | | 2000 | 7,141 | | 1999 | 7,236 | | 1998 | 7,278 | | 1997 | 7,253 | | 1996 | 7,173 | | 1995 | 7,042 | | 1994 | 6,910 | | 1993 | 6,819 | | 1992 | 6,758 | | 1991 | 6,747 | | 1990 | 6,773 | | 1989 | 6,806 | | 1988 | 6,808 | | 1987 | 6,756 | | 1986 | 6,659 | | 1985 | 6,541 | | 1984 | 6,421 | | 1983 | 6,290 | | 1982 | 6,128 | | 1981 | 5,931 | | 1980 | 5,701 | | 1979 | 5,459 | | 1978 | 5,225 | | 1977 | 5,008 | | 1976 | 4,815 | | 1975 | 4,640 | | 1974 | 4,485 | | 1973 | 4,338 | | 1972 | 4,192 | | 1971 | 4,048 | | 1970 | 3,906 | | 1969 | 3,803 | | 1968 | 3,751 | | 1967 | 3,717 | | 1966 | 3,698 | | 1965 | 3,690 | | 1964 | 3,687 | | 1963 | 3,686 | | 1962 | 3,689 | | 1961 | 3,700 | | 1960 | 3,706 |
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