Year | Value | 2022 | 25,616 | 2021 | 25,201 | 2020 | 24,815 | 2019 | 24,170 | 2018 | 23,424 | 2017 | 22,842 | 2016 | 22,337 | 2015 | 21,894 | 2014 | 21,391 | 2013 | 20,883 | 2012 | 20,316 | 2011 | 19,443 | 2010 | 18,755 | 2009 | 18,510 | 2008 | 18,132 | 2007 | 17,784 | 2006 | 17,751 | 2005 | 17,832 | 2004 | 18,020 | 2003 | 18,333 | 2002 | 18,651 | 2001 | 18,847 | 2000 | 18,532 | 1999 | 18,140 | 1998 | 18,153 | 1997 | 18,147 | 1996 | 18,041 | 1995 | 17,803 | 1994 | 17,487 | 1993 | 17,153 | 1992 | 16,740 | 1991 | 16,371 | 1990 | 16,076 | 1989 | 15,816 | 1988 | 15,568 | 1987 | 15,347 | 1986 | 14,990 | 1985 | 14,599 | 1984 | 14,328 | 1983 | 14,060 | 1982 | 13,822 | 1981 | 13,627 | 1980 | 13,276 | 1979 | 12,799 | 1978 | 12,446 | 1977 | 12,158 | 1976 | 11,861 | 1975 | 11,681 | 1974 | 11,645 | 1973 | 11,609 | 1972 | 11,482 | 1971 | 11,345 | 1970 | 11,295 | 1969 | 11,236 | 1968 | 11,152 | 1967 | 11,194 | 1966 | 11,371 | 1965 | 11,639 | 1964 | 11,883 | 1963 | 12,033 | 1962 | 12,170 | 1961 | 12,186 | 1960 | 12,036 |
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