Hall thought its construction was not justified. Constituent pressure forced Stott to vote against the Hall government, leading to an early election – the 1970 South Australian state election – which was fought on much fairer electoral boundaries. As expected, Dunstan led Labor to a decisive victory. Further reforms replaced the Playmander with a "one vote one value" system after the 1975 election, at which Labor retained government despite a two-party-preferred vote of 49.2 percent. A further reform was effected following the 1989 election, at which Labor retained government despite a two-party vote of 48.1 percent. It was enacted that the Electoral Districts Boundaries Commission should redraw electoral boundaries after each election, with the objective that the party which received over 50 percent of the state-wide two-party vote at the forthcoming election should win the majority of seats. South Australia is the only state that redistributes electoral boundaries on the basis of the two-party vote. One element of the Playmander remains to this day − the change from multi-member electorates to single-member electorates. Results |} The state-wide two-party preferred vote figures (available from 1944 onward) had only been able to be estimated prior to 1968, as a result of both major parties consistently declining to field candidates in all electorates. This pattern had been occurring ever since numerous controversial fundamental electoral changes (later dubbed the Playmander) took effect from 1938, due in particular to the replacement of the multi-member system (previously used continuously since self-government) with the single-member system. From 1968 onward, both major parties have chosen to consistently field candidates in all electorates, which has since enabled state-wide two-party figures to be calculated rather than estimated. Post-election pendulum Legislative Council results See also Results of the South Australian state election, 1968 (House of Assembly) Candidates of the 1968 South Australian state election Members of the South Australian House of Assembly, 1968-1970 Members of the South Australian Legislative Council, 1968-1970 Playmander Notes External links Two-party preferred figures since 1950, ABC News Online Legislative Council Background, ABC News Online Australian Politics and Elections Database , University of Western Australia Elections in South Australia 1968 elections in Australia 1960s in South Australia March 1968 events in Australia