The score comes after years of record-high support for EU membership.
EU membership
Poles 40% richer than they would be without EU membership, finds report
Among the eight eastern member states that joined in 2004, only Lithuania (60.3%) was found to have had a bigger premium.
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Poland biggest beneficiary of EU membership among eastern member states, finds study
Since joining the EU in 2004, Poland’s economy has grown the third fastest among all 27 countries in the union.