1968	1972a	1972b	1973	1974
1976	1977*	1979a	1979b*	1980a
1980b	1981	1982	1983	1984
1986	1988a	1988b*	1990	1991
1992	1993	1996a	1996b	1997
1998*	1999	2000*	2001	2003
2004a*	2004b	2004c	2007	2008
2010