 In the 1950 census, the number of Hungarians in Slovakia decreased by 240,000 in comparison to 1930.By the 1961 census it had increased by 164,244 to 518,776.The low number in the 1950 census is likely due to re-Slovakization and population exchanges; the higher number in the 1961 census is likely due to the cancellation of re-Slovakization and natural growth of population (in Slovakia population rose 21%, compared to 46% growth of Hungarians in Slovakia in the same period).