| Year | Value | | 2022 | 8,730 | | 2021 | 8,530 | | 2020 | 8,332 | | 2019 | 8,139 | | 2018 | 7,980 | | 2017 | 7,851 | | 2016 | 7,738 | | 2015 | 7,629 | | 2014 | 7,520 | | 2013 | 7,400 | | 2012 | 7,272 | | 2011 | 7,154 | | 2010 | 7,052 | | 2009 | 6,961 | | 2008 | 6,875 | | 2007 | 6,796 | | 2006 | 6,726 | | 2005 | 6,661 | | 2004 | 6,601 | | 2003 | 6,544 | | 2002 | 6,489 | | 2001 | 6,436 | | 2000 | 6,382 | | 1999 | 6,328 | | 1998 | 6,278 | | 1997 | 6,227 | | 1996 | 6,176 | | 1995 | 6,124 | | 1994 | 6,071 | | 1993 | 6,016 | | 1992 | 5,960 | | 1991 | 5,901 | | 1990 | 5,842 | | 1989 | 5,779 | | 1988 | 5,714 | | 1987 | 5,648 | | 1986 | 5,582 | | 1985 | 5,514 | | 1984 | 5,449 | | 1983 | 5,387 | | 1982 | 5,327 | | 1981 | 5,266 | | 1980 | 5,201 | | 1979 | 5,134 | | 1978 | 5,067 | | 1977 | 5,002 | | 1976 | 4,936 | | 1975 | 4,874 | | 1974 | 4,814 | | 1973 | 4,754 | | 1972 | 4,695 | | 1971 | 4,633 | | 1970 | 4,569 | | 1969 | 4,502 | | 1968 | 4,438 | | 1967 | 4,377 | | 1966 | 4,317 | | 1965 | 4,257 | | 1964 | 4,198 | | 1963 | 4,141 | | 1962 | 4,086 | | 1961 | 4,029 | | 1960 | 3,972 |
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