CREATE TABLE table_35491 ("Year of census" FLOAT, "total" FLOAT, "Croats" TEXT, "Serbs" TEXT, "Others" TEXT)

What is the average total of the census after 1971 with 10,412 (32.88%) Serbs?
SELECT AVG("total") FROM table_35491 WHERE "Year of census" > '1971' AND "Serbs" = '10,412 (32.88%)'
SELECT AVG("total") FROM "table_35491" WHERE "Serbs" = '10,412 (32.88%)' AND "Year of census" > '1971'