Ethnic Lithuanian numbers in the city of Vilnius reached record lows in 1931 (1600 residents – 0.8%, while Poles accounted for 65.9% – 128,600 residents) following the 1922 annexation of Vilnius Region by Poland and the Lithuanians retreat from the region to the temporary capital of Kaunas. Following the Soviet–Lithuanian Mutual Assistance Treaty in 1939, Lithuania recovered the Vilnius Region and made efforts to Lithuanize Vilnius by the introduction of Lithuanian laws. Prime Minister Antanas Merkys once said that it was intended "to make everybody think like Lithuanians. First of all, it was and still is necessary to comb out the foreign element from the Vilnius Region". The Lithuanian Government put into force a law according to which "who on 12 July 1920 (...) were regarded as Lithuanian nationals, and on 27 October 1939 were resident in the territory became Lithuanian nationals" (this definition of citizenship was used to dismiss a large number of Polish civil servants and ~150,000 Poles were later repatriated from the Lithuanian SSR). Almost the whole Jewish population was exterminated during the Holocaust in Lithuania. After World War II, the number of ethnic Lithuanians in the city started recovering (e.g. there already were 79,363 Lithuanians in 1959, who accounted for 33.6% of all residents in the city), however the Lithuanization ideas were mostly replaced with the Sovietization of the population after the rigged election to the People's Seimas in 1940. Following the restoration of independence in 1990, the ethnic Lithuanian population in the city continued to grow and according to the 2011 census of Lithuania already reached 63.2% (337,000 residents).