Year | Value | 2022 | 24,463 | 2021 | 24,845 | 2020 | 25,164 | 2019 | 25,427 | 2018 | 25,646 | 2017 | 25,733 | 2016 | 25,880 | 2015 | 26,171 | 2014 | 26,383 | 2013 | 26,579 | 2012 | 26,821 | 2011 | 26,907 | 2010 | 26,875 | 2009 | 26,972 | 2008 | 27,159 | 2007 | 27,379 | 2006 | 27,724 | 2005 | 28,272 | 2004 | 28,995 | 2003 | 29,777 | 2002 | 30,546 | 2001 | 31,275 | 2000 | 31,934 | 1999 | 32,368 | 1998 | 32,621 | 1997 | 32,838 | 1996 | 32,977 | 1995 | 33,033 | 1994 | 32,988 | 1993 | 32,831 | 1992 | 32,595 | 1991 | 32,299 | 1990 | 31,947 | 1989 | 31,636 | 1988 | 31,390 | 1987 | 31,127 | 1986 | 30,862 | 1985 | 30,592 | 1984 | 30,243 | 1983 | 29,773 | 1982 | 29,189 | 1981 | 28,509 | 1980 | 27,781 | 1979 | 27,298 | 1978 | 27,152 | 1977 | 27,150 | 1976 | 27,204 | 1975 | 27,150 | 1974 | 26,805 | 1973 | 26,268 | 1972 | 25,728 | 1971 | 25,167 | 1970 | 24,539 | 1969 | 23,906 | 1968 | 23,340 | 1967 | 22,829 | 1966 | 22,350 | 1965 | 21,895 | 1964 | 21,706 | 1963 | 21,706 | 1962 | 21,551 | 1961 | 21,235 | 1960 | 20,820 |
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