Year | Value | 2022 | 33,660 | 2021 | 33,745 | 2020 | 34,007 | 2019 | 34,178 | 2018 | 34,156 | 2017 | 34,056 | 2016 | 33,834 | 2015 | 33,570 | 2014 | 33,389 | 2013 | 33,285 | 2012 | 33,132 | 2011 | 32,495 | 2010 | 31,608 | 2009 | 31,059 | 2008 | 30,700 | 2007 | 30,372 | 2006 | 29,959 | 2005 | 29,508 | 2004 | 29,093 | 2003 | 28,601 | 2002 | 27,969 | 2001 | 27,335 | 2000 | 26,823 | 1999 | 26,404 | 1998 | 25,997 | 1997 | 25,596 | 1996 | 25,235 | 1995 | 24,886 | 1994 | 24,535 | 1993 | 24,181 | 1992 | 23,808 | 1991 | 23,459 | 1990 | 23,132 | 1989 | 22,803 | 1988 | 22,542 | 1987 | 22,437 | 1986 | 22,390 | 1985 | 22,241 | 1984 | 22,096 | 1983 | 21,973 | 1982 | 21,804 | 1981 | 21,596 | 1980 | 21,346 | 1979 | 21,087 | 1978 | 20,795 | 1977 | 20,482 | 1976 | 20,160 | 1975 | 19,803 | 1974 | 19,439 | 1973 | 19,010 | 1972 | 18,575 | 1971 | 18,212 | 1970 | 18,169 | 1969 | 18,403 | 1968 | 18,291 | 1967 | 17,907 | 1966 | 17,588 | 1965 | 17,273 | 1964 | 16,926 | 1963 | 16,583 | 1962 | 16,242 | 1961 | 15,895 | 1960 | 15,556 |
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