CREATE TABLE table_204_349 (id DECIMAL, "year" DECIMAL, "conservative\ councillors" DECIMAL, "labour\ councillors" DECIMAL, "independent\ councillors" DECIMAL, "liberal\ councillors" DECIMAL)

how many years had at least 15 or more independent councillors ?
SELECT COUNT("year") FROM table_204_349 WHERE "independent\ncouncillors" >= 15
SELECT COUNT("year") FROM "table_204_349" WHERE "independent\ncouncillors" >= 15