| Year | Value | | 2022 | 9,177 | | 2021 | 9,141 | | 2020 | 9,124 | | 2019 | 9,231 | | 2018 | 9,480 | | 2017 | 9,773 | | 2016 | 10,070 | | 2015 | 10,335 | | 2014 | 10,418 | | 2013 | 10,175 | | 2012 | 9,838 | | 2011 | 9,525 | | 2010 | 9,278 | | 2009 | 9,089 | | 2008 | 8,899 | | 2007 | 8,675 | | 2006 | 8,427 | | 2005 | 8,109 | | 2004 | 7,816 | | 2003 | 7,604 | | 2002 | 7,374 | | 2001 | 7,123 | | 2000 | 6,873 | | 1999 | 6,633 | | 1998 | 6,418 | | 1997 | 6,248 | | 1996 | 6,109 | | 1995 | 5,997 | | 1994 | 5,890 | | 1993 | 5,761 | | 1992 | 5,618 | | 1991 | 5,447 | | 1990 | 5,238 | | 1989 | 5,067 | | 1988 | 4,934 | | 1987 | 4,774 | | 1986 | 4,619 | | 1985 | 4,494 | | 1984 | 4,381 | | 1983 | 4,274 | | 1982 | 4,180 | | 1981 | 4,081 | | 1980 | 3,985 | | 1979 | 3,912 | | 1978 | 3,855 | | 1977 | 3,788 | | 1976 | 3,710 | | 1975 | 3,657 | | 1974 | 3,626 | | 1973 | 3,577 | | 1972 | 3,515 | | 1971 | 3,378 | | 1970 | 3,160 | | 1969 | 2,970 | | 1968 | 2,894 | | 1967 | 2,836 | | 1966 | 2,771 | | 1965 | 2,708 | | 1964 | 2,669 | | 1963 | 2,629 | | 1962 | 2,589 | | 1961 | 2,563 | | 1960 | 2,545 |
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