Year | Value | 2022 | 51,319 | 2021 | 51,410 | 2020 | 51,483 | 2019 | 51,075 | 2018 | 50,451 | 2017 | 49,845 | 2016 | 49,272 | 2015 | 48,750 | 2014 | 48,281 | 2013 | 48,145 | 2012 | 48,421 | 2011 | 48,974 | 2010 | 48,409 | 2009 | 46,555 | 2008 | 44,689 | 2007 | 42,823 | 2006 | 40,983 | 2005 | 39,214 | 2004 | 37,561 | 2003 | 36,065 | 2002 | 34,747 | 2001 | 34,453 | 2000 | 35,231 | 1999 | 36,294 | 1998 | 37,020 | 1997 | 36,541 | 1996 | 35,247 | 1995 | 33,821 | 1994 | 32,281 | 1993 | 30,618 | 1992 | 28,819 | 1991 | 26,861 | 1990 | 24,703 | 1989 | 22,361 | 1988 | 17,649 | 1987 | 13,142 | 1986 | 12,351 | 1985 | 12,802 | 1984 | 13,342 | 1983 | 13,911 | 1982 | 14,429 | 1981 | 14,847 | 1980 | 15,065 | 1979 | 14,903 | 1978 | 14,073 | 1977 | 12,296 | 1976 | 9,365 | 1975 | 7,385 | 1974 | 6,988 | 1973 | 6,614 | 1972 | 6,248 | 1971 | 5,901 | 1970 | 5,592 | 1969 | 5,315 | 1968 | 5,074 | 1967 | 4,853 | 1966 | 4,640 | 1965 | 4,440 | 1964 | 4,249 | 1963 | 4,068 | 1962 | 3,891 | 1961 | 3,722 | 1960 | 3,564 |
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