1972	1974a	1974b	1975**	1976a
1976b	1976c	1977	1978	1980a
1980b**	1983a	1983b	1984**	1986a
1986b**	1987	1988	1989	1993a*
1993b**	1994a	1994b*	1996	1997
1998a	1998b	2001a	2001b	2003**
2004a	2004b	2005a	2005b*	2005c**
2006	2007	2009a	2009b	2011a
2011b	2011c	2013a	2013b*	2013c*
2015	2017