Year | Value | 2022 | 48,530 | 2021 | 45,255 | 2020 | 42,025 | 2019 | 38,984 | 2018 | 36,592 | 2017 | 34,880 | 2016 | 33,870 | 2015 | 33,520 | 2014 | 33,617 | 2013 | 33,941 | 2012 | 34,339 | 2011 | 34,134 | 2010 | 33,285 | 2009 | 32,473 | 2008 | 31,878 | 2007 | 31,527 | 2006 | 31,354 | 2005 | 31,239 | 2004 | 31,009 | 2003 | 30,523 | 2002 | 29,366 | 2001 | 27,469 | 2000 | 25,454 | 1999 | 23,637 | 1998 | 21,864 | 1997 | 20,272 | 1996 | 17,399 | 1995 | 14,305 | 1994 | 18,701 | 1993 | 23,098 | 1992 | 21,488 | 1991 | 20,211 | 1990 | 19,195 | 1989 | 18,462 | 1988 | 18,080 | 1987 | 17,943 | 1986 | 17,853 | 1985 | 17,768 | 1984 | 17,771 | 1983 | 17,858 | 1982 | 17,830 | 1981 | 17,651 | 1980 | 17,434 | 1979 | 17,167 | 1978 | 16,811 | 1977 | 16,475 | 1976 | 16,224 | 1975 | 16,032 | 1974 | 15,905 | 1973 | 15,838 | 1972 | 15,811 | 1971 | 15,742 | 1970 | 15,572 | 1969 | 15,300 | 1968 | 14,916 | 1967 | 14,455 | 1966 | 14,050 | 1965 | 13,788 | 1964 | 13,665 | 1963 | 13,720 | 1962 | 13,875 | 1961 | 13,952 | 1960 | 13,893 |
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