Voting in a referendum is compulsory for those on the electoral roll, in the same way that it is compulsory to vote in a general election. As of 2020, 44 nation-wide referendums have been held, only eight of which have been carried. However, there have only been 19 times the Australian people have gone to the polls to vote on constitutional amendments, as it is common to have multiple questions on the ballot. There have also been three nation-wide plebiscites (two on conscription and one on the national song), and one postal survey (on same-sex marriage).