| Year | Value | | 2022 | 13,978 | | 2021 | 13,733 | | 2020 | 13,349 | | 2019 | 12,848 | | 2018 | 12,285 | | 2017 | 11,785 | | 2016 | 11,371 | | 2015 | 11,042 | | 2014 | 10,800 | | 2013 | 10,646 | | 2012 | 10,572 | | 2011 | 10,568 | | 2010 | 10,617 | | 2009 | 10,687 | | 2008 | 10,659 | | 2007 | 10,591 | | 2006 | 10,547 | | 2005 | 10,417 | | 2004 | 10,214 | | 2003 | 10,068 | | 2002 | 9,957 | | 2001 | 9,773 | | 2000 | 9,545 | | 1999 | 9,286 | | 1998 | 9,016 | | 1997 | 8,821 | | 1996 | 8,641 | | 1995 | 8,367 | | 1994 | 8,246 | | 1993 | 8,087 | | 1992 | 7,643 | | 1991 | 7,133 | | 1990 | 6,635 | | 1989 | 6,225 | | 1988 | 5,809 | | 1987 | 5,386 | | 1986 | 5,068 | | 1985 | 4,787 | | 1984 | 4,596 | | 1983 | 4,504 | | 1982 | 4,444 | | 1981 | 4,473 | | 1980 | 4,524 | | 1979 | 4,523 | | 1978 | 4,529 | | 1977 | 4,545 | | 1976 | 4,543 | | 1975 | 4,511 | | 1974 | 4,469 | | 1973 | 4,413 | | 1972 | 4,349 | | 1971 | 4,290 | | 1970 | 4,237 | | 1969 | 4,194 | | 1968 | 4,158 | | 1967 | 4,123 | | 1966 | 4,075 | | 1965 | 4,015 | | 1964 | 3,950 | | 1963 | 3,884 | | 1962 | 3,814 | | 1961 | 3,742 | | 1960 | 3,674 |
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