Demographics of Turkey in modern Turkey is a highly debated and difficult issue. Figures published in several different sources prove this difficulty by varying greatly. It is necessary to take into account all these difficulties and be cautious while evaluating the ethnic groups. A possible list of ethnic groups living in Turkey could be as follows: According to the 2012 edition of the CIA World Factbook, 70-75% of Turkey's population consists of ethnic Turks, with Kurds accounting for 18% and other minorities between 7 and 12%. According to Milliyet, a 2008 report prepared for the National Security Council of Turkey by academics of
Population exchange between Greece and Turkey a legitimizing factor or a "safe criterion" in marking ethnic groups as Turkish or as Greek in the population exchange. As a result, the Greek-Turkish population exchange did exchange the Greek-Orthodox population of Anatolia, Turkey and the Muslim population of Greece. However, due to the heterogeneous nature of these former Ottoman lands, many other ethnic groups posed social and legal challenges to the terms of the agreement for years after its signing. Among these were the Protestant and Catholic Greeks, the Arabs, Albanians, Russians, Serbians, Romanians of the Greek Orthodox religion; the Albanian, Bulgarian, Greek Muslims of Macedonia and Epirus,