Some private companies have set up wind parks in parts of Inner Mongolia such as Bailingmiao, Hutengliang and Zhouzi. Hohhot Export Processing Zone was established 21 June 2002 by the State Council, which is located in the west of the Hohhot, with a planning area of . Industries encouraged in the export processing zone include Electronics Assembly & Manufacturing, Telecommunications Equipment, Garment and Textiles Production, Trading and Distribution, Biotechnology/Pharmaceuticals, Food/Beverage Processing, Instruments & Industrial Equipment Production, Medical Equipment and Supplies, Shipping/Warehousing/Logistics, Heavy Industry. Under the Constitution of the People's Republic of China, articles 112-122, autonomous regions have limited autonomy in both the political and economic arena. Autonomous regions have more discretion in administering economic policy in the region in accordance with national guidelines. Structurally, the Chairman—who legally must be an ethnic minority and is usually ethnic Mongolian—is always kept in check by the Communist Party Regional Committee Secretary, who is usually from a different part of China (to reduce corruption) and Han Chinese. , the current party secretary is Li Jiheng. The Inner Mongolian government and its subsidiaries follow roughly the same structure as that of a Chinese province. With regards to economic policy, as a part of increased federalism characteristics in China, Inner Mongolia has become more independent in implementing its own economic roadmap. The position of Chairman of Inner Mongolia alternates between Khorchin Mongols in the east and the Tumed Mongols in the west. Since the end of the Cultural Revolution, this convention has not been broken. The family of Ulanhu has retained influence in regional politics ever since the founding the People's Republic. His son Buhe and granddaughter Bu Xiaolin both served as Chairman of the region. When the autonomous region was established in 1947, Han Chinese comprised 83.6% of the population, while the Mongols comprised 14.8% of the population. By 2010, the percentage of Han Chinese had dropped to 79.5%. While the Hetao region along the Yellow River has always alternated between farmers from the south and nomads from the north, the most recent wave of Han Chinese migration began in the early 18th century with encouragement from the Qing dynasty, and continued into the 20th century. Han Chinese live mostly in the Hetao region as well as various population centres in central and eastern Inner Mongolia. Over 70% of Mongols are concentrated in less than 18% of Inner Mongolia's territory (Hinggan League, and the prefectures of Tongliao and Chifeng).