(Articles 111–122) of the Constitution of the People's Republic of China, and with more detail under the Law of the People's Republic of China on Regional National Autonomy (). The constitution states that the head of government of each autonomous areas must be of the ethnic group as specified by the autonomous area (such as Tibetan or Uyghur). The constitution also guarantees a range of rights including: independence of finance, independence of economic planning, independence of arts, science and culture, organization of local police, and use of local language. In addition, the head of government of each autonomous region is known as a "chairman", unlike provinces, where they are known as "governors". Demographics Of the five autonomous regions, only Tibet has an absolute majority (>50%) of the designated ethnic group, since Tibetans make up 90% of the population as of 2011. Xinjiang is more ethnically diverse, with the titular Uyghurs making up a plurality at 46%, Han making up 39%, and various other ethnic groups making up the remaining 15% as of 2015. The remaining three autonomous regions have absolute majorities of Han people, the most populous ethnic group in China. History Autonomous regions, prefectures, counties, and banners were established after communist takeover, following Soviet practice. At first, the nomenclature of these autonomous areas were somewhat confused, with autonomous regions appearing at the province, prefecture, county, and township levels. Eventually the nomenclature was standardized to the conventions used today. The first autonomous region to be established was Inner Mongolia, created within communist-held territory in 1947, two years before the establishment of the People's Republic. Xinjiang was converted from a province to an autonomous region in 1955. Guangxi and Ningxia followed in 1958, and the Tibet Autonomous Region was formally established in 1965. References bg:Автономни региони в КНР