President of Bangladesh Ziaur Rahman created a Chittagong Hill Tracts Development Board under an army general to address the socioeconomic needs of the region, but the entity proved unpopular and became a source of antagonism and mistrust amongst the native people against the government. The government failed to address the long-standing issue of the displacement of people, numbering an estimated 100,000 caused by the construction of the Kaptai Dam in 1962. In the 1980s, the government began settling Bengalis in the region, causing the eviction of many natives and a significant alteration of demographics. Having constituted only 11.6% of the regional population in 1974, the number of Bengalis grew by 1991 to constitute 48.5% of the regional population. In 1989, the government of then-president Hossain Mohammad Ershad passed the District Council Act created three ties of local government councils to devolve powers and responsibilities to the representatives of the native peoples, but the councils were rejected and opposed by the PCJSS.