Turks form one of the largest ethnic groups in Austria, numbering around 350,000. 13,000 Turks were naturalised in 2003 and an unknown number have arrived in Austria at the same time. While 2,000 Turks left Austria in the same year, 10,000 immigrated to the country, confirming a strong trend of growth. Together, Serbs, Croats, Bosniaks, Macedonians, and Slovenes make up about 5.1% of Austria's total population.