Year | Value | 2022 | 36,522 | 2021 | 35,707 | 2020 | 34,843 | 2019 | 33,545 | 2018 | 32,370 | 2017 | 31,963 | 2016 | 32,581 | 2015 | 34,007 | 2014 | 35,792 | 2013 | 37,554 | 2012 | 38,859 | 2011 | 39,413 | 2010 | 39,419 | 2009 | 38,944 | 2008 | 37,946 | 2007 | 36,809 | 2006 | 35,994 | 2005 | 35,797 | 2004 | 36,150 | 2003 | 36,666 | 2002 | 36,921 | 2001 | 36,676 | 2000 | 35,717 | 1999 | 34,010 | 1998 | 31,828 | 1997 | 29,489 | 1996 | 27,452 | 1995 | 26,065 | 1994 | 25,199 | 1993 | 24,444 | 1992 | 23,597 | 1991 | 22,630 | 1990 | 21,999 | 1989 | 22,188 | 1988 | 23,118 | 1987 | 24,632 | 1986 | 26,454 | 1985 | 28,180 | 1984 | 29,470 | 1983 | 30,266 | 1982 | 30,804 | 1981 | 31,430 | 1980 | 32,238 | 1979 | 33,020 | 1978 | 33,503 | 1977 | 33,430 | 1976 | 32,740 | 1975 | 31,524 | 1974 | 29,897 | 1973 | 27,963 | 1972 | 26,003 | 1971 | 24,351 | 1970 | 23,178 | 1969 | 22,455 | 1968 | 22,120 | 1967 | 22,055 | 1966 | 22,064 | 1965 | 21,969 | 1964 | 21,697 | 1963 | 21,374 | 1962 | 21,095 | 1961 | 20,857 | 1960 | 20,633 |
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