What year is the season with the 10.73 million views?
CREATE TABLE "u_s_broadcast_and_ratings" (
  "season" real,
  "timeslot_et" text,
  "season_premiere" text,
  "season_finale" text,
  "tv_season" text,
  "rank" text,
  "viewers_millions" text
);
SELECT "tv_season" FROM "u_s_broadcast_and_ratings" WHERE "viewers_millions"='10.73';