centers. The remote areas of the country are reached by a domestic satellite system, while the number of subscribers to mobile-cellular telephone service is growing rapidly. The main line international telephone service is provided by the SEA-ME-WE 3 submarine communications cable and by submarine fiber-optic cables in the Mediterranean Sea and Black Sea that link Turkey with Italy, Greece, Israel, Bulgaria, Romania, and Russia. In 2002, there were 12 Intelsat satellite earth stations; and 328 mobile satellite terminals in the Inmarsat and Eutelsat systems. Türksat A.Ş. is the primary communications satellite operator of Turkey, controlling the Turksat series of satellites. Göktürk-1, Göktürk-2 and Göktürk-3 are Turkey's earth observation satellites for reconnaissance, operated by the Turkish Ministry of National Defense. BILSAT-1 and RASAT are the scientific observation satellites operated by the TÜBİTAK Space Technologies Research Institute, which (together with Turkish Aerospace Industries and Aselsan) also takes part in the production of Turkey's satellites. As of 2001, there were 16 AM, 107 FM, and 6 shortwave radio stations in the country. As of 2015, there were 42,275,017 internet users in Turkey, which ranked 15th in the world; while as of 2012, there were 7,093,000 internet hosts in the country, which ranked 16th in the world. Tourism In 2019, Turkey ranked sixth in the world in terms of the number of international tourist arrivals, with 51.2 million foreign tourists visiting the country. Over the years, Turkey has emerged as a popular tourist destination for many Europeans, competing with Greece, Italy and Spain. Resorts in provinces such as Antalya and Muğla (which are located on the Turkish Riviera) have become very popular among tourists. Banking and finance The Central Bank of the Republic of Turkey (Türkiye Cumhuriyet Merkez Bankası) was founded in 1930, as a privileged joint-stock company. It possesses the sole right to issue notes. It also has the obligation to provide for the monetary requirements of the state agricultural and commercial enterprises. All foreign exchange transfers are exclusively handled by the central bank. Originally established as the Ottoman Stock Exchange (Dersaadet Tahvilat Borsası) in 1866, and reorganized to its current structure at the beginning of 1986, the Istanbul Stock Exchange (ISE) is the sole securities market of Turkey. During the 19th and early 20th centuries, Bankalar Caddesi (Banks Street) in Istanbul was the financial center of the Ottoman Empire, where the headquarters of the Ottoman Central Bank (established as the Bank-ı Osmanî