According to a 2003 United Nations High Commissioner for Refugees report, unidentified local authorities expelled Azeris in response to anti-Armenian pogroms in Sumgait and Baku of 1988–89. Armenians reached 98% of the national population. Armenian nationalists, together with the Soviet republic's administration, were thought to have co-operated in driving Azeris out. The remainder of the Azerbaijani population was driven away from country in 1991. By 2004, Armenia was the only country of the former USSR with a homogeneous population (97,9% Armenians) and not more than 30 Azerbaijanis were living in Armenia.