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In page Prague:

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About 14% of the city's residents were born outside the Czech Republic, the highest ratio anywhere in the country.[citation needed] However, 64.8% of the city's population self-identified as ethnically Czech, which is slightly higher than the national average of 63.7%. Almost 29% of respondents declined to answer the question on ethnicity at all, so it may be assumed that the real percentage of ethnic Czechs in Prague is considerably higher. The largest ethnic minority are Slovaks, followed by Ukrainians and Russians.[3]