| Year | Value | | 2022 | 6,767 | | 2021 | 6,812 | | 2020 | 6,769 | | 2019 | 6,661 | | 2018 | 6,508 | | 2017 | 6,314 | | 2016 | 6,104 | | 2015 | 5,887 | | 2014 | 5,650 | | 2013 | 5,402 | | 2012 | 5,154 | | 2011 | 4,915 | | 2010 | 4,700 | | 2009 | 4,521 | | 2008 | 4,364 | | 2007 | 4,216 | | 2006 | 4,078 | | 2005 | 3,961 | | 2004 | 3,871 | | 2003 | 3,808 | | 2002 | 3,758 | | 2001 | 3,722 | | 2000 | 3,681 | | 1999 | 3,606 | | 1998 | 3,489 | | 1997 | 3,349 | | 1996 | 3,201 | | 1995 | 3,068 | | 1994 | 2,960 | | 1993 | 2,867 | | 1992 | 2,777 | | 1991 | 2,685 | | 1990 | 2,582 | | 1989 | 2,465 | | 1988 | 2,353 | | 1987 | 2,253 | | 1986 | 2,169 | | 1985 | 2,099 | | 1984 | 2,039 | | 1983 | 1,987 | | 1982 | 1,950 | | 1981 | 1,911 | | 1980 | 1,866 | | 1979 | 1,831 | | 1978 | 1,810 | | 1977 | 1,794 | | 1976 | 1,779 | | 1975 | 1,760 | | 1974 | 1,736 | | 1973 | 1,707 | | 1972 | 1,672 | | 1971 | 1,633 | | 1970 | 1,604 | | 1969 | 1,638 | | 1968 | 1,714 | | 1967 | 1,772 | | 1966 | 1,813 | | 1965 | 1,845 | | 1964 | 1,867 | | 1963 | 1,874 | | 1962 | 1,867 | | 1961 | 1,847 | | 1960 | 1,838 |
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