sentences:  Russian was an official language in parallel to, and in practice often instead of, Estonian in Estonian SSR and there were no integration efforts during the Soviet time, resulting in considerable groups of people knowing very little or no Estonian.After Estonia re-established independence, Estonian again became the only official language.The mass deportations of ethnic Estonians during the Soviet era together with migration into Estonia from other parts of the Soviet Union resulted in the share of ethnic Estonians in the country decreasing from 88% in 1934 to 62% in 1989.