Year | Value | 2022 | 47,608 | 2021 | 47,108 | 2020 | 47,191 | 2019 | 47,313 | 2018 | 47,120 | 2017 | 46,916 | 2016 | 46,958 | 2015 | 46,785 | 2014 | 46,646 | 2013 | 46,936 | 2012 | 46,877 | 2011 | 46,170 | 2010 | 44,513 | 2009 | 41,960 | 2008 | 39,287 | 2007 | 37,628 | 2006 | 37,981 | 2005 | 39,844 | 2004 | 42,415 | 2003 | 45,542 | 2002 | 48,279 | 2001 | 49,038 | 2000 | 48,697 | 1999 | 47,360 | 1998 | 45,509 | 1997 | 44,822 | 1996 | 44,937 | 1995 | 45,818 | 1994 | 47,336 | 1993 | 49,324 | 1992 | 50,676 | 1991 | 51,182 | 1990 | 51,372 | 1989 | 51,255 | 1988 | 50,818 | 1987 | 49,989 | 1986 | 48,692 | 1985 | 46,417 | 1984 | 43,397 | 1983 | 40,354 | 1982 | 36,877 | 1981 | 33,540 | 1980 | 32,278 | 1979 | 33,275 | 1978 | 34,967 | 1977 | 37,546 | 1976 | 40,821 | 1975 | 43,229 | 1974 | 44,279 | 1973 | 44,404 | 1972 | 44,277 | 1971 | 44,042 | 1970 | 43,525 | 1969 | 42,821 | 1968 | 42,384 | 1967 | 42,074 | 1966 | 41,531 | 1965 | 41,289 | 1964 | 41,057 | 1963 | 40,269 | 1962 | 39,217 | 1961 | 38,289 | 1960 | 37,312 |
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