Tibetans are the main inhabitants on the plateau. Tibetans are happy people,  they know how to enjoy their life in any circumstance. At present there are Tibetan, Menpa, Luopa, Han Chinese, hui, sherpa and a few Deng people living in Tibet while Tibetans are the main inhabitants on the plateau. Most Tibetans in cities fell to craftsmen. However, more and more people step into business nowadays. Traditionally farmers settled in small villages, mainly growing barley while the roaming nomads earned their living by herding yaks and sheep. Most Tibetans in cities fell to craftsmen. However, more and more people step into business nowadays. Tibetan language belongs to Sino-Tibetan phylum. People in U and Tsang, Kham and Chamdo speak different dialects. Most Tibetans are devout Buddhists while a few believe in the old Bon. Islam and Catholicism also have a few followers in Lhasa and Yanjing respectively. Since China's Family Planning program is not carried out among Tibetan people, Tibetan population keeps growing. According to the census conducted in 2000, there are 2,616,300 people in Tibet, with Tibetans totaling 2,411,100 and 92.2% of the current Tibet population. The statistic also shows that Tibetans' average life reaches 68 due to the improving standard of living and medical service. The illiterate people are reduced to 850,700.