Year | Value | 2022 | 18,385 | 2021 | 18,830 | 2020 | 19,212 | 2019 | 19,454 | 2018 | 19,613 | 2017 | 19,697 | 2016 | 19,646 | 2015 | 19,659 | 2014 | 19,852 | 2013 | 20,060 | 2012 | 20,195 | 2011 | 20,206 | 2010 | 20,053 | 2009 | 19,878 | 2008 | 19,944 | 2007 | 20,277 | 2006 | 20,688 | 2005 | 20,957 | 2004 | 20,991 | 2003 | 20,907 | 2002 | 20,869 | 2001 | 21,006 | 2000 | 21,275 | 1999 | 21,710 | 1998 | 22,164 | 1997 | 22,630 | 1996 | 23,141 | 1995 | 23,700 | 1994 | 24,255 | 1993 | 24,816 | 1992 | 25,390 | 1991 | 25,767 | 1990 | 25,915 | 1989 | 26,056 | 1988 | 26,238 | 1987 | 26,435 | 1986 | 26,629 | 1985 | 26,884 | 1984 | 27,157 | 1983 | 27,330 | 1982 | 27,402 | 1981 | 27,362 | 1980 | 27,096 | 1979 | 26,753 | 1978 | 26,556 | 1977 | 26,483 | 1976 | 26,471 | 1975 | 26,477 | 1974 | 26,513 | 1973 | 26,612 | 1972 | 26,811 | 1971 | 27,180 | 1970 | 27,737 | 1969 | 28,469 | 1968 | 29,361 | 1967 | 30,363 | 1966 | 31,308 | 1965 | 31,997 | 1964 | 32,399 | 1963 | 32,601 | 1962 | 32,592 | 1961 | 32,442 | 1960 | 32,350 |
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