How many times did the 2nd season have a finale?
CREATE TABLE "american_television_ratings" (
  "season" text,
  "timeslot" text,
  "season_premiere" text,
  "season_finale" text,
  "episodes" real,
  "tv_season" text,
  "ranking" text,
  "viewers_in_millions" text
);
SELECT COUNT("season_finale") FROM "american_television_ratings" WHERE "season"='2nd';