unknown 1973 1974 1975 1976 1979 1980 1981 1985 1986 1987 1988 1989 1990 1991 1993 1994 1996 1997 1999 2000 2001 2003 2004 2005 2007 2008 2009 2010 2011 2012 2014 2015 2018 2019 2021