Burundi is governed as a presidential representative democratic republic, with an estimated population of 10,557,259. The country has experienced a long history of social unrest and ethnic tension between the Hutu majority and Tutsi minority, with successive civil wars jeopardizing national development since Burundi's decolonization as a Belgian territory in 1962. The most recent conflict broke out in 1993 with the assassination of Burundi's first democratically elected president, Melchior Ndadaye, and led to large-scale violations of human rights and general impunity. In line with the Arusha Agreement of August 2000, peace was brokered between rebel groups the National Council for the Defense of Democracy–Forces for the Defense of Democracy (CNDD-FDD) and the National Forces of Liberation