Year | Value | 2022 | 23,680 | 2021 | 22,603 | 2020 | 23,117 | 2019 | 24,925 | 2018 | 27,298 | 2017 | 29,363 | 2016 | 30,487 | 2015 | 30,505 | 2014 | 29,656 | 2013 | 28,344 | 2012 | 26,992 | 2011 | 26,022 | 2010 | 25,629 | 2009 | 25,766 | 2008 | 26,210 | 2007 | 26,610 | 2006 | 26,674 | 2005 | 26,368 | 2004 | 25,644 | 2003 | 24,565 | 2002 | 23,342 | 2001 | 22,034 | 2000 | 20,705 | 1999 | 19,482 | 1998 | 18,429 | 1997 | 17,555 | 1996 | 16,905 | 1995 | 16,472 | 1994 | 16,236 | 1993 | 16,271 | 1992 | 16,568 | 1991 | 16,978 | 1990 | 17,352 | 1989 | 17,525 | 1988 | 17,505 | 1987 | 17,239 | 1986 | 16,686 | 1985 | 16,153 | 1984 | 15,773 | 1983 | 15,550 | 1982 | 15,435 | 1981 | 15,212 | 1980 | 14,716 | 1979 | 14,061 | 1978 | 13,325 | 1977 | 12,476 | 1976 | 11,628 | 1975 | 10,843 | 1974 | 10,102 | 1973 | 9,400 | 1972 | 8,800 | 1971 | 8,385 | 1970 | 8,202 | 1969 | 8,275 | 1968 | 8,659 | 1967 | 9,240 | 1966 | 9,755 | 1965 | 10,029 | 1964 | 10,046 | 1963 | 9,787 | 1962 | 9,290 | 1961 | 8,760 | 1960 | 8,343 |
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