unknown 1957 1958 1964 1966 1968 1970 1972 1974 1975 1976 1977 1979 1980 1983 1985 1986 1988 1989 1992 1993 1994 1996 1997 1998 2005 2006 2007 2008 2009 2010 2012 2013 2014 2016