Which episode had a share 16-19 of 23,22%?
CREATE TABLE "rating_figures" (
  "episode" real,
  "date" text,
  "official_rating_4" text,
  "share_4" text,
  "official_rating_16_39" text,
  "share_16_39" text
);
SELECT MAX("episode") FROM "rating_figures" WHERE "share_16_39"='23,22%';