Year | Value | 2022 | 43,244 | 2021 | 39,544 | 2020 | 36,224 | 2019 | 33,291 | 2018 | 30,736 | 2017 | 29,421 | 2016 | 29,531 | 2015 | 30,913 | 2014 | 33,078 | 2013 | 35,312 | 2012 | 36,997 | 2011 | 37,763 | 2010 | 37,673 | 2009 | 37,075 | 2008 | 36,275 | 2007 | 35,570 | 2006 | 35,147 | 2005 | 35,009 | 2004 | 35,116 | 2003 | 35,390 | 2002 | 35,537 | 2001 | 35,171 | 2000 | 34,155 | 1999 | 32,404 | 1998 | 29,752 | 1997 | 26,453 | 1996 | 23,468 | 1995 | 21,354 | 1994 | 19,930 | 1993 | 18,976 | 1992 | 18,170 | 1991 | 17,280 | 1990 | 16,518 | 1989 | 16,328 | 1988 | 16,900 | 1987 | 17,851 | 1986 | 18,603 | 1985 | 18,840 | 1984 | 18,749 | 1983 | 18,700 | 1982 | 18,648 | 1981 | 18,608 | 1980 | 18,708 | 1979 | 18,869 | 1978 | 19,043 | 1977 | 19,225 | 1976 | 19,353 | 1975 | 19,410 | 1974 | 19,365 | 1973 | 19,162 | 1972 | 18,806 | 1971 | 18,299 | 1970 | 17,616 | 1969 | 16,825 | 1968 | 15,987 | 1967 | 15,188 | 1966 | 14,545 | 1965 | 14,121 | 1964 | 13,947 | 1963 | 14,082 | 1962 | 14,431 | 1961 | 14,714 | 1960 | 14,751 |
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