Kurdish population there are significant minorities adhering to Shia Islam (especially Alevis), Yazidism, Yarsanism, Christianity and Judaism. According to a report by Turkish agency KONDA, in 2006, out of the total population of 73 million people in Turkey there were 11.4 million Kurds and Zazas living in Turkey (close to 15.68% of the total population). The Turkish newspaper Milliyet reported in 2008 that the Kurdish population in Turkey is 12.6 million; although this also includes 3 million Zazas. According to the World Factbook, Kurdish people make up 18% of Turkey's population (about 14 million, out of 77.8 million people). Kurdish sources put
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,