Referenda on EU accession

Before their accession to the EU, 9 out of 10 of the applicant countries held referendums (not Cyprus):

Czech Republic Referendum15/16 June 2003, 77% voted "Yes"
Cyprus Parliamentary ratification after the signature of the Accession Act
Estonia Referendum 14 September 2003, 66.9% voted "Yes"
Hungary Referendum 12 April 2003, 84% voted "Yes"
Latvia Referendum 20 September 2003, 67% voted "Yes"
Lithuania Referendum 11 May 2003, 90% voted "Yes"
Malta Referendum 8 March 2003, 53% voted "Yes"
Poland Referendum 7-8 June 2003, 77.5% voted "Yes"
Slovakia Referendum 16/17 May 2003, 92.5% voted "Yes"
Slovenia Referendum 23 March 2003, 89% voted "Yes"