# Years Size Links
DUP 1968–1989
four Southern parties 1986–1988
NIF 1989–1989
NUP 1956–1967
PDP 1956–1967
SNC 1997–2008
Southern parties 1989–1989
SSU 1969–1985
trade unions 1989–1989
Umma 1956–1989
UNF 1964–1965