Year | Value | 2022 | 30,815 | 2021 | 30,831 | 2020 | 31,069 | 2019 | 31,384 | 2018 | 31,796 | 2017 | 32,361 | 2016 | 33,091 | 2015 | 33,989 | 2014 | 35,052 | 2013 | 36,287 | 2012 | 37,686 | 2011 | 39,202 | 2010 | 40,614 | 2009 | 41,683 | 2008 | 42,300 | 2007 | 42,420 | 2006 | 42,085 | 2005 | 41,416 | 2004 | 40,566 | 2003 | 39,682 | 2002 | 38,901 | 2001 | 38,519 | 2000 | 38,405 | 1999 | 38,051 | 1998 | 37,293 | 1997 | 36,102 | 1996 | 34,543 | 1995 | 32,782 | 1994 | 31,073 | 1993 | 29,701 | 1992 | 29,168 | 1991 | 29,427 | 1990 | 29,874 | 1989 | 30,224 | 1988 | 30,338 | 1987 | 30,146 | 1986 | 29,698 | 1985 | 29,147 | 1984 | 28,689 | 1983 | 28,518 | 1982 | 28,938 | 1981 | 30,016 | 1980 | 31,311 | 1979 | 32,433 | 1978 | 33,250 | 1977 | 33,739 | 1976 | 33,992 | 1975 | 34,166 | 1974 | 34,334 | 1973 | 34,181 | 1972 | 33,509 | 1971 | 32,609 | 1970 | 31,790 | 1969 | 31,244 | 1968 | 31,036 | 1967 | 31,075 | 1966 | 31,110 | 1965 | 30,805 | 1964 | 29,973 | 1963 | 28,669 | 1962 | 27,136 | 1961 | 25,767 | 1960 | 24,973 |
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