Year | Value | 2022 | 32,330 | 2021 | 32,172 | 2020 | 32,328 | 2019 | 32,697 | 2018 | 33,584 | 2017 | 35,069 | 2016 | 37,115 | 2015 | 39,375 | 2014 | 42,417 | 2013 | 45,992 | 2012 | 48,796 | 2011 | 50,820 | 2010 | 51,809 | 2009 | 51,701 | 2008 | 51,296 | 2007 | 50,782 | 2006 | 50,548 | 2005 | 50,729 | 2004 | 50,719 | 2003 | 50,380 | 2002 | 50,278 | 2001 | 50,391 | 2000 | 50,432 | 1999 | 49,355 | 1998 | 48,271 | 1997 | 48,520 | 1996 | 49,190 | 1995 | 50,071 | 1994 | 50,873 | 1993 | 51,469 | 1992 | 53,377 | 1991 | 55,653 | 1990 | 55,678 | 1989 | 54,237 | 1988 | 53,400 | 1987 | 54,185 | 1986 | 55,442 | 1985 | 56,549 | 1984 | 57,595 | 1983 | 58,403 | 1982 | 58,753 | 1981 | 59,103 | 1980 | 59,680 | 1979 | 59,864 | 1978 | 59,523 | 1977 | 58,920 | 1976 | 58,292 | 1975 | 57,454 | 1974 | 57,117 | 1973 | 57,535 | 1972 | 57,680 | 1971 | 56,716 | 1970 | 54,212 | 1969 | 50,074 | 1968 | 45,716 | 1967 | 43,269 | 1966 | 43,205 | 1965 | 44,448 | 1964 | 46,160 | 1963 | 48,351 | 1962 | 50,300 | 1961 | 50,577 | 1960 | 50,145 |
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