conference was attended by General secretary Hu Jintao, Wu Bangguo, Wen Jiabao, Jia Qinglin, Li Changchun, Xi Jinping, Li Keqiang, He Guoqiang and Zhou Yongkang, all members of Politburo Standing Committee of the Chinese Communist Party. The plan called for improvement of rural Tibetan income to national standards by 2020 and free education for all rural Tibetan children. China has invested 310 billion yuan (about 45.6 billion U.S. dollars) in Tibet since 2001. Development zone The State Council approved Tibet Lhasa Economic and Technological Development Zone as a state-level development zone in 2001. It is located in the western suburbs of Lhasa, the capital of the Tibet Autonomous Region. It is away from the Gonggar Airport, and away from Lhasa Railway Station and away from 318 national highway. The zone has a planned area of and is divided into two zones. Zone A developed a land area of for construction purposes. It is a flat zone, and has the natural conditions for good drainage. Demographics Historically, the population of Tibet consisted of primarily ethnic Tibetans and some other ethnic groups. According to tradition the original ancestors of the Tibetan people, as represented by the six red bands in the Tibetan flag, are: the Se, Mu, Dong, Tong, Dru and Ra. Other traditional ethnic groups with significant population or with the majority of the ethnic group residing in Tibet (excluding a disputed area with India) include Bai people, Blang, Bonan, Dongxiang, Han, Hui people, Lhoba, Lisu people, Miao, Mongols, Monguor (Tu people), Menba (Monpa), Mosuo, Nakhi, Qiang, Nu people, Pumi, Salar, and Yi people. The proportion of the non-Tibetan population in Tibet is disputed. On the one hand, the Central Tibetan Administration of the Dalai Lama accuses China of actively swamping Tibet with migrants in order to alter Tibet's demographic makeup. On the other hand, according to the 2010 Chinese census ethnic Tibetans comprise 90% of a total population of 3 million in the Tibet Autonomous Region. Culture Religion Buddhism Religion is extremely important to the Tibetans and has a strong influence over all aspects of their lives. Bön is the indigenous religion of Tibet, but has been almost eclipsed by Tibetan Buddhism, a distinctive form of Mahayana and Vajrayana, which was introduced into Tibet from the Sanskrit Buddhist tradition of northern India. Tibetan Buddhism is practiced not only in Tibet but also in Mongolia, parts of northern India, the Buryat