As a result of World War II, Lviv was depolonised, mainly through Soviet-arranged population exchange in 1944–1946 but also by early deportations to Siberia. Those who remained on their own volition after the border shift became a small ethnic minority in Lviv. By 1959 Poles made up only 4% of the local population. Many families were mixed. During the Soviet decades only two Polish schools continued to function: No. 10 (with 8 grades) and No. 24 (with 10 grades).