(1922–2018)
1 December 1986
(1910–1989)
23 June 1989(died in office)
(b. 1937)
9 April 1992(removed by coup)
16 June 1992
1 December 1998
(ASU)
21 September 2001(impeached)
1 December 2002
1 December 2010
1 December 2018
present
(Independent)