Year | Value | 2022 | 27,917 | 2021 | 29,141 | 2020 | 30,387 | 2019 | 30,653 | 2018 | 30,189 | 2017 | 29,791 | 2016 | 29,425 | 2015 | 29,076 | 2014 | 28,749 | 2013 | 28,435 | 2012 | 28,123 | 2011 | 27,801 | 2010 | 27,490 | 2009 | 27,192 | 2008 | 26,883 | 2007 | 26,586 | 2006 | 26,374 | 2005 | 26,312 | 2004 | 26,432 | 2003 | 26,788 | 2002 | 27,426 | 2001 | 28,368 | 2000 | 28,362 | 1999 | 27,201 | 1998 | 25,897 | 1997 | 24,361 | 1996 | 22,518 | 1995 | 20,287 | 1994 | 17,588 | 1993 | 14,373 | 1992 | 12,442 | 1991 | 12,077 | 1990 | 11,744 | 1989 | 11,437 | 1988 | 11,153 | 1987 | 10,898 | 1986 | 10,669 | 1985 | 10,463 | 1984 | 10,285 | 1983 | 10,141 | 1982 | 10,032 | 1981 | 9,956 | 1980 | 9,916 | 1979 | 9,917 | 1978 | 9,964 | 1977 | 10,054 | 1976 | 10,158 | 1975 | 10,260 | 1974 | 10,342 | 1973 | 10,400 | 1972 | 10,444 | 1971 | 10,474 | 1970 | 10,494 | 1969 | 10,498 | 1968 | 10,478 | 1967 | 10,438 | 1966 | 10,390 | 1965 | 10,345 | 1964 | 10,306 | 1963 | 10,272 | 1962 | 10,251 | 1961 | 10,250 | 1960 | 10,284 |
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