Year | Value | 2022 | 18,675 | 2021 | 18,811 | 2020 | 19,058 | 2019 | 19,329 | 2018 | 19,601 | 2017 | 19,938 | 2016 | 20,226 | 2015 | 20,394 | 2014 | 20,597 | 2013 | 20,897 | 2012 | 21,130 | 2011 | 21,304 | 2010 | 21,474 | 2009 | 21,583 | 2008 | 21,539 | 2007 | 21,344 | 2006 | 20,976 | 2005 | 20,491 | 2004 | 19,887 | 2003 | 19,054 | 2002 | 18,134 | 2001 | 17,095 | 2000 | 15,665 | 1999 | 14,291 | 1998 | 13,288 | 1997 | 12,641 | 1996 | 12,545 | 1995 | 13,119 | 1994 | 14,081 | 1993 | 15,123 | 1992 | 16,055 | 1991 | 16,682 | 1990 | 16,942 | 1989 | 16,893 | 1988 | 16,652 | 1987 | 16,333 | 1986 | 16,037 | 1985 | 15,816 | 1984 | 15,633 | 1983 | 15,412 | 1982 | 15,098 | 1981 | 14,682 | 1980 | 14,136 | 1979 | 13,408 | 1978 | 12,504 | 1977 | 11,469 | 1976 | 10,354 | 1975 | 9,229 | 1974 | 8,181 | 1973 | 7,285 | 1972 | 6,605 | 1971 | 6,177 | 1970 | 6,033 | 1969 | 6,186 | 1968 | 6,585 | 1967 | 7,156 | 1966 | 7,797 | 1965 | 8,407 | 1964 | 8,901 | 1963 | 9,230 | 1962 | 9,373 | 1961 | 9,352 | 1960 | 9,196 |
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