Year | Value | 2022 | 36,685 | 2021 | 37,618 | 2020 | 38,110 | 2019 | 38,998 | 2018 | 38,673 | 2017 | 37,506 | 2016 | 37,441 | 2015 | 37,052 | 2014 | 36,282 | 2013 | 35,293 | 2012 | 34,076 | 2011 | 32,870 | 2010 | 31,983 | 2009 | 31,377 | 2008 | 30,990 | 2007 | 30,846 | 2006 | 30,952 | 2005 | 31,289 | 2004 | 31,794 | 2003 | 32,391 | 2002 | 33,138 | 2001 | 33,992 | 2000 | 34,794 | 1999 | 35,488 | 1998 | 36,071 | 1997 | 36,583 | 1996 | 37,052 | 1995 | 37,492 | 1994 | 37,934 | 1993 | 38,377 | 1992 | 38,804 | 1991 | 39,256 | 1990 | 39,811 | 1989 | 40,431 | 1988 | 41,020 | 1987 | 41,533 | 1986 | 41,922 | 1985 | 42,146 | 1984 | 42,157 | 1983 | 41,941 | 1982 | 41,463 | 1981 | 40,718 | 1980 | 39,914 | 1979 | 39,063 | 1978 | 38,026 | 1977 | 36,898 | 1976 | 35,751 | 1975 | 34,549 | 1974 | 33,313 | 1973 | 32,076 | 1972 | 30,850 | 1971 | 29,660 | 1970 | 28,626 | 1969 | 27,737 | 1968 | 26,907 | 1967 | 26,147 | 1966 | 25,434 | 1965 | 24,745 | 1964 | 24,064 | 1963 | 23,391 | 1962 | 22,746 | 1961 | 22,142 | 1960 | 21,581 |
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