What is the total number of Week, when Opponent is At Chicago Bears, and when Attendance is greater than 49,070?
CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "attendance" real
);
SELECT COUNT("week") FROM "schedule" WHERE "opponent"='at chicago bears' AND "attendance">'49,070';