user: Question: What is the 1961 total of the Macedonian population with a 1971 number of 3325 and a 1991 value greater than 3177?
Columns: ['Macedonian population in Vojvodina', '1961', 'Number 1971', '1981', '1991', '2002']
Types: ['text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Dužine', 223.0, 143.0, 90.0, 84.0, 68.0]
SQL:

assistant: SELECT SUM("1961") FROM "Table" WHERE "Number 1971" = 3325.0 AND "1991" > 3177.0;