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Television in Turkey was introduced in 1952 with the launch of ITU TV. The first television broadcast work carried out as closed-circuit television broadcast in Turkey was prepared in June-July 1966. The first national television channel in Turkey was TRT 1, which was introduced in 1968. Color television was introduced in 1981. Turkey's first private television channel, Star, began broadcasting on 26 May 1989. There was only one television channel controlled by the state until the wave of liberalization in the 1990s which began privately owned broadcasting. Turkey's television market is defined by a handful of large channels, led by Kanal D, ATV and Show, with 14%, 10% and 9.6% market share, respectively.