1945–present thumb|Henk van Rossum (party leader 1981–1986), Cor van Dis Sr. (party leader 1961–1971) and Hette Abma (party leader 1971–1981) in the House of Representatives in 1973. Kersten was succeeded by Zandt, under whose leadership the SGP was very stable, continually getting 2% of votes. In the 1956 general election, the SGP profited from the enlargement of parliament, and entered the Senate for the first time. It lost that seat in 1960 Senate election, but regained it in the 1971 Senate election.
1945–Present THumb|hEnk van rossUM (Party leaDeR 1981–1986) COR vaN dIs sr (pArTy leaDEr 1961–1971) and hettE abmA (partY leaDEr 1971–1981) in The HOuSE of repREseNtAtiVEs iN 1973 kersten was succEedeD By zAnDT under whOse LEAderShip The SGP wAs very StABLE continualLy getTIng 2% OF VoTES In tHe 1956 gEneraL eleCtiON thE sgp profiteD FROM the enlaRgemEnt Of ParlIAMENt anD entereD the Senate FoR the fiRSt time iT lOsT thAt sEat in 1960 sEnate ELecTiON but RegainED IT IN the 1971 seNate eleCtIon