Year | Value | 2022 | 48,634 | 2021 | 48,975 | 2020 | 48,465 | 2019 | 47,422 | 2018 | 46,009 | 2017 | 44,485 | 2016 | 43,112 | 2015 | 42,140 | 2014 | 41,643 | 2013 | 41,681 | 2012 | 42,318 | 2011 | 43,498 | 2010 | 45,077 | 2009 | 46,709 | 2008 | 48,128 | 2007 | 49,047 | 2006 | 49,274 | 2005 | 48,866 | 2004 | 48,002 | 2003 | 46,947 | 2002 | 45,838 | 2001 | 44,842 | 2000 | 43,807 | 1999 | 42,607 | 1998 | 41,308 | 1997 | 40,226 | 1996 | 39,209 | 1995 | 38,410 | 1994 | 37,615 | 1993 | 36,269 | 1992 | 34,549 | 1991 | 32,408 | 1990 | 30,275 | 1989 | 28,542 | 1988 | 27,032 | 1987 | 25,597 | 1986 | 24,290 | 1985 | 23,153 | 1984 | 22,095 | 1983 | 21,249 | 1982 | 20,906 | 1981 | 20,848 | 1980 | 20,814 | 1979 | 20,687 | 1978 | 20,418 | 1977 | 20,025 | 1976 | 19,411 | 1975 | 18,807 | 1974 | 18,363 | 1973 | 18,189 | 1972 | 18,306 | 1971 | 18,625 | 1970 | 19,013 | 1969 | 19,305 | 1968 | 19,349 | 1967 | 19,080 | 1966 | 18,504 | 1965 | 17,672 | 1964 | 16,712 | 1963 | 15,760 | 1962 | 14,976 | 1961 | 14,474 | 1960 | 14,480 |
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