European Union representation within those institutions, a practice often referred to as "pooling of sovereignty". 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 yet left the Union, although Greenland (an autonomous province of Denmark) withdrew in 1985. Article 50 of
Basque Country (autonomous community) into a separate autonomous community. Currently there is no official capital in the autonomous community, but the city of Vitoria-Gasteiz, in the province of Álava, is the de facto capital as the location of the Basque Parliament, the headquarters of the Basque Government, and the residence of the President of the Basque Autonomous Community (the Palace of Ajuria Enea). Whilst Vitoria-Gasteiz is the largest municipality in area, with 277 km (107 sq mi), Bilbao (or "Bilbo" in Basque) is the largest in population, with 353,187 people, located in the province of Biscay within a conurbation of 875,552 people. The term