Year | Value | 2022 | 31,951 | 2021 | 31,787 | 2020 | 31,348 | 2019 | 30,612 | 2018 | 29,653 | 2017 | 28,627 | 2016 | 27,561 | 2015 | 26,469 | 2014 | 25,763 | 2013 | 25,328 | 2012 | 24,697 | 2011 | 24,006 | 2010 | 23,441 | 2009 | 22,616 | 2008 | 21,807 | 2007 | 21,138 | 2006 | 20,950 | 2005 | 21,502 | 2004 | 22,107 | 2003 | 22,726 | 2002 | 23,286 | 2001 | 23,736 | 2000 | 24,019 | 1999 | 24,122 | 1998 | 24,063 | 1997 | 23,845 | 1996 | 23,604 | 1995 | 23,359 | 1994 | 22,991 | 1993 | 22,555 | 1992 | 22,092 | 1991 | 21,603 | 1990 | 21,112 | 1989 | 20,636 | 1988 | 20,172 | 1987 | 19,731 | 1986 | 19,329 | 1985 | 19,024 | 1984 | 18,828 | 1983 | 18,644 | 1982 | 18,422 | 1981 | 18,132 | 1980 | 17,767 | 1979 | 17,338 | 1978 | 16,856 | 1977 | 16,354 | 1976 | 15,780 | 1975 | 15,125 | 1974 | 14,482 | 1973 | 13,886 | 1972 | 13,361 | 1971 | 12,931 | 1970 | 12,602 | 1969 | 12,372 | 1968 | 12,228 | 1967 | 12,156 | 1966 | 12,048 | 1965 | 11,900 | 1964 | 11,789 | 1963 | 11,681 | 1962 | 11,555 | 1961 | 11,401 | 1960 | 11,214 |
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