unknown 1957 1962 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1982 1983 1984 1985 1987 1989 1992 1993 1994 1995 1997 1999 2000 2003 2004 2005 2006 2008 2010 2011 2013 2017