| Year | Value | | 2022 | 12,320 | | 2021 | 11,917 | | 2020 | 11,617 | | 2019 | 11,234 | | 2018 | 10,944 | | 2017 | 10,890 | | 2016 | 10,804 | | 2015 | 10,597 | | 2014 | 10,469 | | 2013 | 10,328 | | 2012 | 10,123 | | 2011 | 10,175 | | 2010 | 10,455 | | 2009 | 10,779 | | 2008 | 11,051 | | 2007 | 11,135 | | 2006 | 11,002 | | 2005 | 10,851 | | 2004 | 10,764 | | 2003 | 10,663 | | 2002 | 10,560 | | 2001 | 10,485 | | 2000 | 10,354 | | 1999 | 10,098 | | 1998 | 9,826 | | 1997 | 9,563 | | 1996 | 9,346 | | 1995 | 9,136 | | 1994 | 8,891 | | 1993 | 8,683 | | 1992 | 8,510 | | 1991 | 8,210 | | 1990 | 7,879 | | 1989 | 7,635 | | 1988 | 7,328 | | 1987 | 7,026 | | 1986 | 6,748 | | 1985 | 6,422 | | 1984 | 6,081 | | 1983 | 5,742 | | 1982 | 5,434 | | 1981 | 5,282 | | 1980 | 5,262 | | 1979 | 5,299 | | 1978 | 5,359 | | 1977 | 5,442 | | 1976 | 5,517 | | 1975 | 5,613 | | 1974 | 5,705 | | 1973 | 5,721 | | 1972 | 5,700 | | 1971 | 5,669 | | 1970 | 5,550 | | 1969 | 5,395 | | 1968 | 5,348 | | 1967 | 5,329 | | 1966 | 5,283 | | 1965 | 5,236 | | 1964 | 5,163 | | 1963 | 5,058 | | 1962 | 4,962 | | 1961 | 4,865 | | 1960 | 4,751 |
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