Year | Value | 2022 | 24,356 | 2021 | 24,132 | 2020 | 24,020 | 2019 | 24,494 | 2018 | 25,154 | 2017 | 25,297 | 2016 | 25,041 | 2015 | 24,384 | 2014 | 23,341 | 2013 | 21,989 | 2012 | 20,522 | 2011 | 19,203 | 2010 | 18,221 | 2009 | 17,651 | 2008 | 17,586 | 2007 | 17,932 | 2006 | 18,353 | 2005 | 18,585 | 2004 | 18,587 | 2003 | 18,297 | 2002 | 17,752 | 2001 | 17,245 | 2000 | 16,988 | 1999 | 16,935 | 1998 | 17,028 | 1997 | 17,257 | 1996 | 17,500 | 1995 | 17,668 | 1994 | 17,791 | 1993 | 17,907 | 1992 | 18,014 | 1991 | 18,146 | 1990 | 18,367 | 1989 | 18,742 | 1988 | 19,305 | 1987 | 19,953 | 1986 | 20,442 | 1985 | 20,587 | 1984 | 20,336 | 1983 | 19,637 | 1982 | 18,609 | 1981 | 17,671 | 1980 | 17,106 | 1979 | 16,903 | 1978 | 17,081 | 1977 | 17,509 | 1976 | 17,802 | 1975 | 17,716 | 1974 | 17,250 | 1973 | 16,404 | 1972 | 15,273 | 1971 | 14,144 | 1970 | 13,233 | 1969 | 12,530 | 1968 | 12,001 | 1967 | 11,613 | 1966 | 11,198 | 1965 | 10,651 | 1964 | 9,993 | 1963 | 9,246 | 1962 | 8,454 | 1961 | 7,762 | 1960 | 7,272 |
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