Schooling is free, and in principle, compulsory for children aged 7 through 13, but only 84.1% of the adult population is literate. In 1996 an around 94 % of primary school-aged children were listed in school, but only 13% of the relevantly aged children attended secondary or technical schools. The National University in Butare, opened in 1963, had about 2,500 students in the early 1990s. after the violence began in April 1994, education at all levels ceased and has yet to be fully restored.