Turkey is a founding member of the United Nations, the Organisation of the Islamic Conference (now the Organisation of Islamic Cooperation), the Organisation for Economic Co-operation and Development and the Organization for Security and Co-operation in Europe, a member state of the Council of Europe since 1949, and of NATO since 1952. Since 2005, Turkey is in accession negotiations with the European Union, having been an associate member since 1963. Turkey is also a member of the G20 industrial nations which brings together the 20 largest economies of the world.