1976 1978 1979 1980 1981a
1981b 1982 1983a 1983b 1984
1985a* 1985b 1985c 1986a 1986b
1987 1988 1989 1990 1991
1993 1994a 1994b 1997 1998a
1998b 2001 2002 2005 2006
2008 2010