What was the fewest number of viewers for the episode production number of 109 5-22?
CREATE TABLE "united_states" (
  "episode_number_production_number" text,
  "title" text,
  "original_airing" text,
  "rating" real,
  "share" real,
  "18_49" real,
  "total_viewers_in_millions" real,
  "rank_per_week" text
);
SELECT MIN("total_viewers_in_millions") FROM "united_states" WHERE "episode_number_production_number"='109 5-22';