Popular initiatives by parliamentary term 1960-2011 
Initiated referenda 1960-2011 
Definitions/comments
Initiatives: a proposal for a constitutional amendment or a new constitutional article is subject to popular vote if the proposal is signed by at least 100,000 citizens who have the right to vote. Since 1977, signatures have to be collected within a period of 18 months.
Source: Federal Chancellery, political rights (own analysis).
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