Albanian-speakers of Western Thrace migrated towards today's European Turkey (Eastern Thrace), especially near Istanbul. Many Muslim Albanians achieved high office in Ottoman society and many of them, most notably the Köprülü family, became Grand Viziers of the Empire. The majority of the Albanian emigration came from Northern Kosovo and the Korça region of Albania. Descendants of this immigrants would later play an important role in the National Renaissance of Albania. The number of Albanians that resided in the region is unknown, as statistical data of the Ottoman Empire were based on religious identification (millets). Thus, the Orthodox Albanians were part of the Rûm millet,
Economy of Turkey 2005. Share of mid and high technology products has increased from 5% in 1980 to 14% in 1990 and 43% in 2005. Turkey is an oil and natural gas producer, but the level of production by the state-owned TPAO isn't large enough to make the country self-sufficient, which makes Turkey a net importer of both oil and gas. However, the recent discovery of new oil and natural gas fields in the country, particularly off the Black Sea coast of northern Anatolia; as well as in Eastern Thrace, the Gulf of İskenderun and in the provinces of the Southeastern Anatolia Region