Year | Value | 2022 | 22,286 | 2021 | 22,339 | 2020 | 22,430 | 2019 | 22,616 | 2018 | 22,942 | 2017 | 23,276 | 2016 | 23,399 | 2015 | 23,221 | 2014 | 22,707 | 2013 | 21,913 | 2012 | 21,024 | 2011 | 20,255 | 2010 | 19,743 | 2009 | 19,603 | 2008 | 19,867 | 2007 | 20,358 | 2006 | 20,849 | 2005 | 21,197 | 2004 | 21,323 | 2003 | 21,142 | 2002 | 20,816 | 2001 | 20,596 | 2000 | 20,498 | 1999 | 20,484 | 1998 | 20,510 | 1997 | 20,498 | 1996 | 20,349 | 1995 | 19,951 | 1994 | 19,262 | 1993 | 18,392 | 1992 | 17,371 | 1991 | 16,229 | 1990 | 15,129 | 1989 | 14,116 | 1988 | 13,199 | 1987 | 12,444 | 1986 | 11,810 | 1985 | 11,220 | 1984 | 10,690 | 1983 | 10,237 | 1982 | 9,857 | 1981 | 9,548 | 1980 | 9,311 | 1979 | 9,227 | 1978 | 9,254 | 1977 | 9,279 | 1976 | 9,319 | 1975 | 9,375 | 1974 | 9,453 | 1973 | 9,552 | 1972 | 9,677 | 1971 | 9,785 | 1970 | 9,859 | 1969 | 9,896 | 1968 | 9,879 | 1967 | 9,795 | 1966 | 9,597 | 1965 | 9,291 | 1964 | 8,980 | 1963 | 8,689 | 1962 | 8,326 | 1961 | 7,945 | 1960 | 7,613 |
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