Year | Value | 2022 | 20,585 | 2021 | 20,713 | 2020 | 20,814 | 2019 | 20,867 | 2018 | 20,905 | 2017 | 20,993 | 2016 | 21,107 | 2015 | 21,297 | 2014 | 21,311 | 2013 | 21,346 | 2012 | 21,572 | 2011 | 21,730 | 2010 | 21,937 | 2009 | 22,150 | 2008 | 22,353 | 2007 | 22,556 | 2006 | 22,752 | 2005 | 22,936 | 2004 | 23,110 | 2003 | 23,274 | 2002 | 23,421 | 2001 | 23,593 | 2000 | 23,740 | 1999 | 23,921 | 1998 | 24,065 | 1997 | 24,175 | 1996 | 24,265 | 1995 | 24,337 | 1994 | 24,396 | 1993 | 24,447 | 1992 | 24,487 | 1991 | 24,558 | 1990 | 25,653 | 1989 | 26,975 | 1988 | 28,301 | 1987 | 29,656 | 1986 | 31,034 | 1985 | 32,426 | 1984 | 33,817 | 1983 | 35,226 | 1982 | 36,659 | 1981 | 38,076 | 1980 | 38,854 | 1979 | 39,342 | 1978 | 39,780 | 1977 | 40,185 | 1976 | 40,549 | 1975 | 40,876 | 1974 | 41,173 | 1973 | 41,454 | 1972 | 41,738 | 1971 | 42,026 | 1970 | 42,244 | 1969 | 41,860 | 1968 | 41,202 | 1967 | 40,565 | 1966 | 39,971 | 1965 | 39,407 | 1964 | 38,892 | 1963 | 38,431 | 1962 | 37,972 | 1961 | 37,498 | 1960 | 36,906 |
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