What was the number of viewers in millions for the broadcast from 2010? 
CREATE TABLE "episodes" (
  "episode" real,
  "broadcast_date" real,
  "bbc_one_presenter_s" text,
  "starring" text,
  "radio_1_presenter" text,
  "viewers_millions" text
);
SELECT "viewers_millions" FROM "episodes" WHERE "broadcast_date"=2010;