Context: Between 1945 and 1989, the share of ethnic Estonians in the population resident within the currently defined boundaries of Estonia dropped to 61%, caused primarily by the Soviet programme promoting mass immigration of urban industrial workers from Russia, Ukraine, and Belarus, as well as by wartime emigration and Joseph Stalin's mass deportations and executions.[citation needed] By 1989, minorities constituted more than one-third of the population, as the number of non-Estonians had grown almost fivefold.

Question: What period did the amount of ethnic Estonians drop by 61%?
Answer: Between 1945 and 1989

Question: What trend caused the drop of ethnic Estonians?
Answer: mass immigration of urban industrial workers from Russia, Ukraine, and Belarus

Question: Who ordered large scales of deportations and executions?
Answer: Joseph Stalin

Question: What year did minorities in Estonia make up more than a third of the country?
Answer: 1989