How many people tuned in to the finale on May 16, 2007?
CREATE TABLE "u_s_television_ratings" (
  "season" text,
  "timeslot" text,
  "premiere" text,
  "finale" text,
  "tv_season" text,
  "ranking" text,
  "viewers_in_millions" real
);
SELECT COUNT("viewers_in_millions") FROM "u_s_television_ratings" WHERE "finale"='may 16, 2007';