Year | Value | 2022 | 44,144 | 2021 | 45,497 | 2020 | 47,157 | 2019 | 48,932 | 2018 | 50,445 | 2017 | 51,415 | 2016 | 51,620 | 2015 | 51,113 | 2014 | 50,040 | 2013 | 48,646 | 2012 | 47,177 | 2011 | 45,918 | 2010 | 45,174 | 2009 | 44,931 | 2008 | 45,191 | 2007 | 45,990 | 2006 | 47,287 | 2005 | 48,863 | 2004 | 50,402 | 2003 | 51,746 | 2002 | 52,610 | 2001 | 52,826 | 2000 | 52,368 | 1999 | 51,377 | 1998 | 49,952 | 1997 | 48,667 | 1996 | 47,540 | 1995 | 46,555 | 1994 | 45,518 | 1993 | 44,284 | 1992 | 43,265 | 1991 | 42,272 | 1990 | 41,435 | 1989 | 40,568 | 1988 | 39,193 | 1987 | 37,262 | 1986 | 34,770 | 1985 | 32,081 | 1984 | 29,767 | 1983 | 27,904 | 1982 | 26,369 | 1981 | 25,046 | 1980 | 23,946 | 1979 | 22,962 | 1978 | 22,196 | 1977 | 21,857 | 1976 | 21,691 | 1975 | 21,634 | 1974 | 21,595 | 1973 | 21,471 | 1972 | 21,217 | 1971 | 20,858 | 1970 | 20,450 | 1969 | 20,138 | 1968 | 20,089 | 1967 | 20,351 | 1966 | 20,855 | 1965 | 21,456 | 1964 | 21,953 | 1963 | 22,170 | 1962 | 21,926 | 1961 | 21,138 | 1960 | 20,573 |
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