| Year | Value | | 2022 | 8,752 | | 2021 | 8,670 | | 2020 | 8,529 | | 2019 | 8,369 | | 2018 | 8,210 | | 2017 | 7,993 | | 2016 | 7,688 | | 2015 | 7,348 | | 2014 | 7,029 | | 2013 | 6,768 | | 2012 | 6,559 | | 2011 | 6,387 | | 2010 | 6,201 | | 2009 | 5,947 | | 2008 | 5,659 | | 2007 | 5,323 | | 2006 | 4,938 | | 2005 | 4,608 | | 2004 | 4,382 | | 2003 | 4,203 | | 2002 | 4,130 | | 2001 | 4,167 | | 2000 | 4,155 | | 1999 | 4,088 | | 1998 | 4,042 | | 1997 | 3,993 | | 1996 | 3,932 | | 1995 | 3,916 | | 1994 | 3,932 | | 1993 | 3,934 | | 1992 | 3,907 | | 1991 | 3,861 | | 1990 | 3,826 | | 1989 | 3,849 | | 1988 | 3,905 | | 1987 | 3,952 | | 1986 | 4,011 | | 1985 | 4,099 | | 1984 | 4,227 | | 1983 | 4,430 | | 1982 | 4,696 | | 1981 | 4,943 | | 1980 | 5,106 | | 1979 | 5,165 | | 1978 | 5,112 | | 1977 | 4,979 | | 1976 | 4,828 | | 1975 | 4,693 | | 1974 | 4,568 | | 1973 | 4,447 | | 1972 | 4,339 | | 1971 | 4,236 | | 1970 | 4,127 | | 1969 | 4,014 | | 1968 | 3,899 | | 1967 | 3,790 | | 1966 | 3,687 | | 1965 | 3,591 | | 1964 | 3,504 | | 1963 | 3,431 | | 1962 | 3,355 | | 1961 | 3,232 | | 1960 | 3,047 |
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