What is the highest attendance that has oakland raiders as the opponent, with a week greater than 9?
CREATE TABLE "regular_season" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "stadium" text,
  "record" text,
  "attendance" real
);
SELECT MAX("attendance") FROM "regular_season" WHERE "opponent"='oakland raiders' AND "week">9;