There has been some protests in Tibet since China took control in the 1950s. Most of them have been because of social or economic problems. Some of them have been because there are people who believe Tibet should not be a part of China. To show their resistance, many Tibetans set themselves on fire to put the Chinese government under pressure to become independent again. In 2011, 19 people killed themselves. A railway line, the Qingzang railway, has been built, linking China to Lhasa. Also, rising prices of food, and difficult access to higher education have angered many people. The railway line also raised fears about more migration. This situation has led to some violence against people from outside Tibet. Some of this violence occurs outside Tibet. When it comes to assigning government posts in Tibet, more other nationalities of Chinese seem to be assigned, rather than Tibetans. The Chinese Government claims that if Tibet became independent again, its economy would suffer.