user: Question: What is every value for Croats if the value of Roma is 3.1%?
Columns: ['Year', 'Population', 'Serbs', 'Germans', 'Romanians', 'Hungarians', 'Croats', 'Roma', 'Slovaks', 'Rest']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1910.0, 34034.0, '45.52%', '19.30%', '16.65%', '15.64%', '0.09%', '1.28%', '0.12%', '1.70%']
SQL:

assistant: SELECT "Croats" FROM "Table" WHERE "Roma" = '3.1%';