unknown 1966 1967 1968 1972 1981 1982 1983 1984 1985 1986 1988 1989 1990 1991 1992 1993 1994 1995 1999 2000 2001 2002 2003 2004 2005 2006 2007 2010 2011 2013 2014 2015 2016 2019 2023