2016 Australian federal election
A double dissolution election was held on 2 July 2016 to elect all 226 members of the 45th Parliament of Australia, after an extended eight-week official campaign period. It was the first double dissolution election since the 1987 election and the first under a new voting system for the Senate that replaced group voting tickets with optional preferential voting.
Source: Wikipedia — 2016 Australian federal election (CC BY-SA 4.0)