| Year | Value | | 2022 | 49,866 | | 2021 | 49,059 | | 2020 | 48,249 | | 2019 | 47,437 | | 2018 | 46,621 | | 2017 | 45,669 | | 2016 | 44,559 | | 2015 | 43,286 | | 2014 | 41,812 | | 2013 | 40,304 | | 2012 | 38,859 | | 2011 | 37,424 | | 2010 | 36,048 | | 2009 | 34,891 | | 2008 | 33,888 | | 2007 | 32,940 | | 2006 | 32,215 | | 2005 | 31,835 | | 2004 | 31,711 | | 2003 | 31,766 | | 2002 | 31,889 | | 2001 | 31,987 | | 2000 | 32,094 | | 1999 | 32,181 | | 1998 | 32,201 | | 1997 | 32,111 | | 1996 | 31,729 | | 1995 | 31,061 | | 1994 | 31,759 | | 1993 | 32,393 | | 1992 | 31,114 | | 1991 | 29,414 | | 1990 | 27,757 | | 1989 | 26,700 | | 1988 | 25,480 | | 1987 | 24,048 | | 1986 | 23,189 | | 1985 | 22,447 | | 1984 | 21,849 | | 1983 | 21,220 | | 1982 | 20,430 | | 1981 | 19,702 | | 1980 | 18,853 | | 1979 | 17,797 | | 1978 | 16,849 | | 1977 | 16,022 | | 1976 | 15,225 | | 1975 | 14,503 | | 1974 | 13,891 | | 1973 | 13,395 | | 1972 | 12,997 | | 1971 | 12,665 | | 1970 | 12,377 | | 1969 | 12,121 | | 1968 | 11,886 | | 1967 | 11,651 | | 1966 | 11,410 | | 1965 | 11,189 | | 1964 | 11,002 | | 1963 | 10,838 | | 1962 | 10,690 | | 1961 | 10,551 | | 1960 | 10,418 |
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