CREATE TABLE table_204_756 (id DECIMAL, "year" DECIMAL, "team" TEXT, "games" DECIMAL, "combined tackles" DECIMAL, "tackles" DECIMAL, "assisted tackles" DECIMAL, "sacks" DECIMAL, "forced fumbles" DECIMAL, "fumble recoveries" DECIMAL, "fumble return yards" DECIMAL, "interceptions" DECIMAL, "interception return yards" DECIMAL, "yards per interception return" DECIMAL, "longest interception return" DECIMAL, "interceptions returned for touchdown" DECIMAL, "passes defended" DECIMAL)

how many seasons had combined tackles of 70 or more ?
SELECT COUNT("year") FROM table_204_756 WHERE "combined tackles" >= 70
SELECT COUNT("year") FROM "table_204_756" WHERE "combined tackles" >= 70