What is the viewers where the rating is 5.3?
CREATE TABLE "u_s_ratings" (
  "num" real,
  "episode" text,
  "air_date" text,
  "rating" text,
  "share" real,
  "18_49_rating_share" text,
  "viewers_m" text,
  "weekly_rank" real
);
SELECT "viewers_m" FROM "u_s_ratings" WHERE "rating"='5.3';