Year | Value | 2022 | 37,142 | 2021 | 37,235 | 2020 | 37,608 | 2019 | 38,196 | 2018 | 38,985 | 2017 | 39,803 | 2016 | 40,554 | 2015 | 41,215 | 2014 | 41,788 | 2013 | 42,258 | 2012 | 42,625 | 2011 | 42,843 | 2010 | 43,061 | 2009 | 43,459 | 2008 | 43,898 | 2007 | 44,242 | 2006 | 44,510 | 2005 | 44,596 | 2004 | 44,372 | 2003 | 43,887 | 2002 | 43,149 | 2001 | 42,156 | 2000 | 40,901 | 1999 | 39,359 | 1998 | 37,716 | 1997 | 36,280 | 1996 | 35,267 | 1995 | 34,855 | 1994 | 35,059 | 1993 | 35,591 | 1992 | 36,163 | 1991 | 36,785 | 1990 | 37,331 | 1989 | 37,720 | 1988 | 38,108 | 1987 | 38,456 | 1986 | 38,610 | 1985 | 38,457 | 1984 | 38,044 | 1983 | 37,432 | 1982 | 36,627 | 1981 | 35,758 | 1980 | 34,796 | 1979 | 33,609 | 1978 | 32,238 | 1977 | 30,812 | 1976 | 29,343 | 1975 | 27,828 | 1974 | 26,612 | 1973 | 25,718 | 1972 | 24,892 | 1971 | 24,215 | 1970 | 23,706 | 1969 | 23,027 | 1968 | 22,218 | 1967 | 21,532 | 1966 | 20,895 | 1965 | 20,292 | 1964 | 19,746 | 1963 | 19,216 | 1962 | 18,670 | 1961 | 18,137 | 1960 | 17,629 |
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