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Kohtla-Järve is a city and municipality in northeastern Estonia, founded in 1924 and incorporated as a town in 1946. The city is highly industrial, and is both a processor of oil shales and is a large producer of various petrochemical products. During the 1944–1991 Soviet occupation, large numbers of immigrant workers from Russia and other parts of the former USSR were brought in to populate the rapidly growing city. The population in the Kohtla-Järve area which had been, as of 1934 census, over 90% ethnic Estonian, became overwhelmingly non-Estonian in the second half of the 20th century. According to more recent data 21% of the city's population are ethnic Estonians; most of the rest are Russians. Kohtla-Järve is the fifth-largest city in Estonia in terms of population.