What is the 18-49 rating/share where the viewers is 5.61?
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 "18_49_rating_share" FROM "u_s_ratings" WHERE "viewers_m"='5.61';