What was the first week when there was an attendance over 75,007 at Mile High Stadium?
CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "game_site" text,
  "record" text,
  "attendance" real
);
SELECT MIN("week") FROM "schedule" WHERE "game_site"='mile high stadium' AND "attendance">'75,007';