In 1981, the University of Pristina consisted of 75 per cent ethnic Albanians out of the 47,000 students attending it. During the late 70s and early 80s the economic situation in Kosovo and Yugoslavia was worsening. Furthermore, negative discrimination of students based on ethnicity led Albanian students of the University of Pristina to organize a massive protest on March 11, 1981, known as the Student Protests of 1981. As a result of violent student riots, restrictions in the education of Albanians were imposed again. As a result of this protest, the previous agreement between Albania and Kosovo, to exchange educational materials, ended and Serbo-Croatian books started to be translated in Albanian to fulfil the needs of the university. Further, students, teachers and professors who participated in these protests were expelled, thus resulting in more than 260 students and more than 210 teachers/professors expelled.