Year | Value | 2022 | 21,693 | 2021 | 21,416 | 2020 | 21,132 | 2019 | 20,816 | 2018 | 20,481 | 2017 | 20,131 | 2016 | 19,923 | 2015 | 19,793 | 2014 | 19,667 | 2013 | 19,613 | 2012 | 19,666 | 2011 | 19,781 | 2010 | 19,993 | 2009 | 20,222 | 2008 | 20,464 | 2007 | 20,761 | 2006 | 21,021 | 2005 | 21,168 | 2004 | 21,345 | 2003 | 21,636 | 2002 | 21,849 | 2001 | 22,006 | 2000 | 22,150 | 1999 | 22,344 | 1998 | 22,413 | 1997 | 22,358 | 1996 | 22,149 | 1995 | 21,813 | 1994 | 21,329 | 1993 | 20,641 | 1992 | 19,743 | 1991 | 18,670 | 1990 | 17,480 | 1989 | 16,262 | 1988 | 15,198 | 1987 | 14,472 | 1986 | 14,249 | 1985 | 14,594 | 1984 | 15,378 | 1983 | 16,368 | 1982 | 17,320 | 1981 | 18,025 | 1980 | 18,339 | 1979 | 18,257 | 1978 | 17,898 | 1977 | 17,418 | 1976 | 16,950 | 1975 | 16,590 | 1974 | 16,319 | 1973 | 16,054 | 1972 | 15,727 | 1971 | 15,304 | 1970 | 14,758 | 1969 | 14,099 | 1968 | 13,334 | 1967 | 12,455 | 1966 | 11,457 | 1965 | 10,385 | 1964 | 9,314 | 1963 | 8,336 | 1962 | 7,543 | 1961 | 7,022 | 1960 | 6,800 |
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