| Year | Value | | 2022 | 11,605 | | 2021 | 11,276 | | 2020 | 11,015 | | 2019 | 10,829 | | 2018 | 10,655 | | 2017 | 10,422 | | 2016 | 10,147 | | 2015 | 9,850 | | 2014 | 9,534 | | 2013 | 9,193 | | 2012 | 8,854 | | 2011 | 8,546 | | 2010 | 8,258 | | 2009 | 8,001 | | 2008 | 7,798 | | 2007 | 7,613 | | 2006 | 7,437 | | 2005 | 7,267 | | 2004 | 7,081 | | 2003 | 6,883 | | 2002 | 6,697 | | 2001 | 6,500 | | 2000 | 6,298 | | 1999 | 6,120 | | 1998 | 5,951 | | 1997 | 5,763 | | 1996 | 5,595 | | 1995 | 5,462 | | 1994 | 5,342 | | 1993 | 5,242 | | 1992 | 5,139 | | 1991 | 5,030 | | 1990 | 4,912 | | 1989 | 4,772 | | 1988 | 4,635 | | 1987 | 4,508 | | 1986 | 4,335 | | 1985 | 4,142 | | 1984 | 3,997 | | 1983 | 3,904 | | 1982 | 3,844 | | 1981 | 3,772 | | 1980 | 3,671 | | 1979 | 3,538 | | 1978 | 3,417 | | 1977 | 3,374 | | 1976 | 3,316 | | 1975 | 3,198 | | 1974 | 3,061 | | 1973 | 2,940 | | 1972 | 2,840 | | 1971 | 2,752 | | 1970 | 2,683 | | 1969 | 2,633 | | 1968 | 2,578 | | 1967 | 2,512 | | 1966 | 2,415 | | 1965 | 2,326 | | 1964 | 2,279 | | 1963 | 2,240 | | 1962 | 2,208 | | 1961 | 2,178 | | 1960 | 2,149 |
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