Year | Value | 2022 | 20,036 | 2021 | 20,156 | 2020 | 20,471 | 2019 | 20,874 | 2018 | 21,195 | 2017 | 21,534 | 2016 | 21,815 | 2015 | 21,850 | 2014 | 21,799 | 2013 | 21,852 | 2012 | 21,988 | 2011 | 22,206 | 2010 | 22,642 | 2009 | 23,278 | 2008 | 23,887 | 2007 | 24,322 | 2006 | 24,617 | 2005 | 24,792 | 2004 | 24,822 | 2003 | 24,685 | 2002 | 24,375 | 2001 | 24,049 | 2000 | 23,712 | 1999 | 23,525 | 1998 | 23,413 | 1997 | 23,419 | 1996 | 23,613 | 1995 | 23,937 | 1994 | 24,330 | 1993 | 24,808 | 1992 | 25,355 | 1991 | 25,777 | 1990 | 26,063 | 1989 | 26,406 | 1988 | 26,854 | 1987 | 27,382 | 1986 | 27,910 | 1985 | 28,350 | 1984 | 28,642 | 1983 | 28,763 | 1982 | 28,725 | 1981 | 28,557 | 1980 | 28,263 | 1979 | 27,956 | 1978 | 27,738 | 1977 | 27,587 | 1976 | 27,434 | 1975 | 27,201 | 1974 | 26,794 | 1973 | 26,139 | 1972 | 25,215 | 1971 | 24,005 | 1970 | 22,486 | 1969 | 20,887 | 1968 | 19,513 | 1967 | 18,554 | 1966 | 18,215 | 1965 | 18,645 | 1964 | 19,727 | 1963 | 21,130 | 1962 | 22,478 | 1961 | 23,397 | 1960 | 23,550 |
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