Ex-Head of State: 1972 - 1978

Ex-Head of State: 1966 - 1969

Ex Head of State: 1978 - 1979

Ex President: 1970 - 1972

Ex-Head of State: 1966 - 1969

Ex-Prime Minister: 1969 - 1972

Ex-Head of State: 1966 - 1969

Ex-Head of State: 2001 - 2008

Ex President: 1979 - 1981

Ex-Head of State: 1957 - 1966

Head of State/President: 1981 - 2000