| Year | Value | | 2022 | 7,813 | | 2021 | 7,942 | | 2020 | 7,994 | | 2019 | 7,932 | | 2018 | 7,751 | | 2017 | 7,510 | | 2016 | 7,256 | | 2015 | 6,972 | | 2014 | 6,669 | | 2013 | 6,427 | | 2012 | 6,236 | | 2011 | 6,042 | | 2010 | 5,865 | | 2009 | 5,710 | | 2008 | 5,582 | | 2007 | 5,468 | | 2006 | 5,348 | | 2005 | 5,208 | | 2004 | 5,049 | | 2003 | 4,866 | | 2002 | 4,657 | | 2001 | 4,440 | | 2000 | 4,231 | | 1999 | 4,033 | | 1998 | 3,870 | | 1997 | 3,749 | | 1996 | 3,649 | | 1995 | 3,562 | | 1994 | 3,484 | | 1993 | 3,395 | | 1992 | 3,291 | | 1991 | 3,195 | | 1990 | 3,123 | | 1989 | 3,073 | | 1988 | 3,033 | | 1987 | 3,009 | | 1986 | 2,996 | | 1985 | 2,983 | | 1984 | 2,969 | | 1983 | 2,949 | | 1982 | 2,922 | | 1981 | 2,896 | | 1980 | 2,868 | | 1979 | 2,839 | | 1978 | 2,813 | | 1977 | 2,789 | | 1976 | 2,759 | | 1975 | 2,721 | | 1974 | 2,675 | | 1973 | 2,621 | | 1972 | 2,559 | | 1971 | 2,493 | | 1970 | 2,430 | | 1969 | 2,370 | | 1968 | 2,314 | | 1967 | 2,269 | | 1966 | 2,229 | | 1965 | 2,187 | | 1964 | 2,148 | | 1963 | 2,110 | | 1962 | 2,066 | | 1961 | 2,020 | | 1960 | 1,977 |
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