To become a member, a country must meet the Copenhagen criteria, defined at the 1993 meeting of the European Council in Copenhagen. These require a stable democracy that respects human rights and the rule of law; a functioning market economy; and the acceptance of the obligations of membership, including EU law. Evaluation of a country's fulfilment of the criteria is the responsibility of the European Council. No member state has ever left the Union, although Greenland (an autonomous province of Denmark) withdrew in 1985. The Lisbon Treaty now contains a clause providing for a member to leave the EU.