Year | Value | 2022 | 35,917 | 2021 | 35,314 | 2020 | 34,205 | 2019 | 34,109 | 2018 | 32,071 | 2017 | 28,858 | 2016 | 27,881 | 2015 | 27,159 | 2014 | 26,795 | 2013 | 26,669 | 2012 | 26,527 | 2011 | 26,531 | 2010 | 26,913 | 2009 | 27,444 | 2008 | 28,062 | 2007 | 28,697 | 2006 | 29,301 | 2005 | 29,857 | 2004 | 30,319 | 2003 | 30,673 | 2002 | 30,985 | 2001 | 31,278 | 2000 | 31,542 | 1999 | 31,813 | 1998 | 32,111 | 1997 | 32,415 | 1996 | 32,695 | 1995 | 32,925 | 1994 | 33,093 | 1993 | 33,189 | 1992 | 33,227 | 1991 | 33,292 | 1990 | 33,620 | 1989 | 34,041 | 1988 | 34,211 | 1987 | 34,100 | 1986 | 33,723 | 1985 | 33,158 | 1984 | 32,476 | 1983 | 31,723 | 1982 | 30,970 | 1981 | 30,197 | 1980 | 29,381 | 1979 | 28,468 | 1978 | 27,387 | 1977 | 26,213 | 1976 | 25,016 | 1975 | 23,852 | 1974 | 22,748 | 1973 | 21,733 | 1972 | 20,854 | 1971 | 20,137 | 1970 | 19,654 | 1969 | 19,405 | 1968 | 19,293 | 1967 | 19,249 | 1966 | 19,197 | 1965 | 19,067 | 1964 | 18,823 | 1963 | 18,486 | 1962 | 18,109 | 1961 | 17,747 | 1960 | 17,410 |
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