Year | Value | 2022 | 31,429 | 2021 | 29,742 | 2020 | 28,026 | 2019 | 26,466 | 2018 | 25,077 | 2017 | 23,907 | 2016 | 23,033 | 2015 | 22,440 | 2014 | 22,085 | 2013 | 21,970 | 2012 | 22,011 | 2011 | 22,117 | 2010 | 22,289 | 2009 | 22,530 | 2008 | 22,786 | 2007 | 23,067 | 2006 | 23,355 | 2005 | 23,583 | 2004 | 23,733 | 2003 | 23,729 | 2002 | 23,581 | 2001 | 23,335 | 2000 | 23,017 | 1999 | 22,660 | 1998 | 22,275 | 1997 | 21,866 | 1996 | 21,458 | 1995 | 21,063 | 1994 | 21,238 | 1993 | 21,228 | 1992 | 20,261 | 1991 | 19,043 | 1990 | 17,736 | 1989 | 16,618 | 1988 | 15,520 | 1987 | 14,402 | 1986 | 13,509 | 1985 | 12,692 | 1984 | 12,018 | 1983 | 11,511 | 1982 | 11,092 | 1981 | 10,817 | 1980 | 10,602 | 1979 | 10,359 | 1978 | 10,147 | 1977 | 9,967 | 1976 | 9,800 | 1975 | 9,638 | 1974 | 9,490 | 1973 | 9,339 | 1972 | 9,191 | 1971 | 9,048 | 1970 | 8,905 | 1969 | 8,766 | 1968 | 8,631 | 1967 | 8,497 | 1966 | 8,367 | 1965 | 8,247 | 1964 | 8,138 | 1963 | 8,041 | 1962 | 7,947 | 1961 | 7,847 | 1960 | 7,740 |
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