Year | Value | 2022 | 17,033 | 2021 | 17,260 | 2020 | 17,546 | 2019 | 17,815 | 2018 | 18,002 | 2017 | 18,112 | 2016 | 18,148 | 2015 | 18,105 | 2014 | 18,059 | 2013 | 18,073 | 2012 | 18,140 | 2011 | 18,284 | 2010 | 18,560 | 2009 | 18,963 | 2008 | 19,447 | 2007 | 19,935 | 2006 | 20,338 | 2005 | 20,594 | 2004 | 20,664 | 2003 | 20,540 | 2002 | 20,220 | 2001 | 19,704 | 2000 | 19,002 | 1999 | 18,136 | 1998 | 17,150 | 1997 | 16,114 | 1996 | 15,132 | 1995 | 14,269 | 1994 | 13,522 | 1993 | 12,901 | 1992 | 12,440 | 1991 | 12,237 | 1990 | 12,286 | 1989 | 12,404 | 1988 | 12,476 | 1987 | 12,444 | 1986 | 12,265 | 1985 | 11,962 | 1984 | 11,632 | 1983 | 11,368 | 1982 | 11,232 | 1981 | 11,366 | 1980 | 11,690 | 1979 | 11,874 | 1978 | 11,781 | 1977 | 11,428 | 1976 | 10,886 | 1975 | 10,245 | 1974 | 9,612 | 1973 | 9,073 | 1972 | 8,655 | 1971 | 8,404 | 1970 | 8,241 | 1969 | 7,969 | 1968 | 7,527 | 1967 | 6,955 | 1966 | 6,319 | 1965 | 5,667 | 1964 | 5,041 | 1963 | 4,485 | 1962 | 4,039 | 1961 | 3,698 | 1960 | 3,496 |
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