1978 1981 1981 1983 1983 1983 1985 1986 1986 1987 1987 1988 1989 1991 1992 1992 1993 1993 1994 1994 1997 2000 2000 2002 2002 2004 2004 2004 2006 2006 2006 2008 2008 2009 2010 2012 2013 2013 2014 2015 2016 2017 2018 