An abrogative referendum on the electoral law was held in Italy on 18 April 1999.Dieter Nohlen & Philip Stöver (2010) Elections in Europe: A data handbook, p1049 Voters were asked whether they approved of replacing the mixed-member proportional representation electoral system (in which 75% of seats in Parliament were elected in single-member constituencies and 25% by compensatory proportional representation) with one based solely on single-member constituencies, with the 25% of seats instead allocated to the second-placed in the constituencies with the most votes.Sunday referendum in Italy to decide on voting system World Socialist Website, 19 April 1999 The proposal was supported by larger parties, but opposed by smaller ones. Although the proposal was approved by 92% of voters, turnout was only 49.58% (i.e., just over 200,000 voters below the threshold), resulting in the referendum being invalidated as the threshold of 50% was not passed.Nohlen & Stöver, p1061
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