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In page Immigration to Turkey:

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By 1980, Turkey had admitted approximately 1,300,000 immigrants; 36% came from Bulgaria, 25% from Greece[citation needed], 22.1% from Yugoslavia, and 8.9% from Romania. These Balkan immigrants, as well as smaller numbers of Turkic immigrants from Cyprus and the Soviet Union, were granted full citizenship upon their arrival in Turkey. The immigrants were settled primarily in the Marmara and Aegean regions (78%) and in Central Anatolia (11.7%).[5]