Ankara headquarters of the Turkish Aerospace Industries, MKE, ASELSAN, Havelsan, Roketsan, FNSS, Nurol Makina, and numerous other firms are located. Exports to foreign countries from these defence and aerospace firms have steadily increased in the past decades. The IDEF in Ankara is one of the largest international expositions of the global arms industry. A number of the global automotive companies also have production facilities in Ankara, such as the German bus and truck manufacturer MAN SE. Ankara hosts the OSTIM Industrial Zone, Turkey's largest industrial park. A large percentage of the complicated employment in Ankara is provided by the state institutions;
Çankaya, Ankara (district) changed in the 1920s when Mustafa Kemal Atatürk came to stay in one of the garden houses. Atatürk selected Ankara as capital of the new republic and in the 1920s and 30s the city quickly grew, especially in the direction of Çankaya. In 1934 the writer Yakup Kadri Karaosmanoğlu described the area as ""a wooden bridge, a dirt road, and when you come round the hill you see a hillside, green in gentle contours. That's Çankaya"." Çankaya eventually developed into one of the largest central districts of Ankara in later years. The climate in Çankaya is cold and temperate. The