Year | Value | 2022 | 46,140 | 2021 | 44,838 | 2020 | 43,629 | 2019 | 42,865 | 2018 | 42,850 | 2017 | 43,555 | 2016 | 44,883 | 2015 | 46,640 | 2014 | 48,482 | 2013 | 50,086 | 2012 | 51,146 | 2011 | 51,463 | 2010 | 51,091 | 2009 | 50,104 | 2008 | 48,780 | 2007 | 47,327 | 2006 | 46,008 | 2005 | 45,107 | 2004 | 44,675 | 2003 | 44,793 | 2002 | 45,494 | 2001 | 46,757 | 2000 | 48,231 | 1999 | 49,607 | 1998 | 50,572 | 1997 | 51,151 | 1996 | 51,017 | 1995 | 50,391 | 1994 | 49,474 | 1993 | 48,169 | 1992 | 47,009 | 1991 | 45,909 | 1990 | 44,985 | 1989 | 44,164 | 1988 | 43,306 | 1987 | 42,558 | 1986 | 41,837 | 1985 | 41,187 | 1984 | 40,418 | 1983 | 39,176 | 1982 | 37,526 | 1981 | 35,381 | 1980 | 33,076 | 1979 | 30,973 | 1978 | 29,114 | 1977 | 27,526 | 1976 | 26,004 | 1975 | 24,650 | 1974 | 23,495 | 1973 | 22,636 | 1972 | 22,143 | 1971 | 21,971 | 1970 | 21,947 | 1969 | 21,870 | 1968 | 21,632 | 1967 | 21,243 | 1966 | 20,770 | 1965 | 20,282 | 1964 | 19,875 | 1963 | 19,658 | 1962 | 19,766 | 1961 | 20,104 | 1960 | 20,763 |
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