Year | Value | 2022 | 39,175 | 2021 | 38,813 | 2020 | 38,449 | 2019 | 38,262 | 2018 | 38,256 | 2017 | 38,312 | 2016 | 38,398 | 2015 | 38,503 | 2014 | 38,634 | 2013 | 38,758 | 2012 | 38,880 | 2011 | 38,989 | 2010 | 39,086 | 2009 | 39,215 | 2008 | 39,362 | 2007 | 39,524 | 2006 | 39,734 | 2005 | 40,023 | 2004 | 40,355 | 2003 | 40,671 | 2002 | 40,948 | 2001 | 40,943 | 2000 | 40,439 | 1999 | 39,879 | 1998 | 39,317 | 1997 | 38,753 | 1996 | 38,198 | 1995 | 37,649 | 1994 | 37,107 | 1993 | 36,581 | 1992 | 36,096 | 1991 | 35,765 | 1990 | 35,655 | 1989 | 35,592 | 1988 | 35,500 | 1987 | 35,356 | 1986 | 35,269 | 1985 | 35,302 | 1984 | 35,357 | 1983 | 35,392 | 1982 | 35,380 | 1981 | 35,221 | 1980 | 34,915 | 1979 | 34,583 | 1978 | 34,233 | 1977 | 33,857 | 1976 | 33,324 | 1975 | 32,593 | 1974 | 31,836 | 1973 | 31,162 | 1972 | 30,574 | 1971 | 29,899 | 1970 | 29,058 | 1969 | 28,228 | 1968 | 27,415 | 1967 | 26,598 | 1966 | 25,773 | 1965 | 25,051 | 1964 | 24,330 | 1963 | 23,623 | 1962 | 22,904 | 1961 | 22,179 | 1960 | 21,450 |
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