What is the rating/share total number if the total viewers is 12.75 million?
CREATE TABLE "ratings" (
  "episode_number_production_number" text,
  "title" text,
  "original_airing" text,
  "rating" text,
  "share" real,
  "rating_share_18_49" text,
  "total_viewers_in_millions" text
);
SELECT COUNT("rating_share_18_49") FROM "ratings" WHERE "total_viewers_in_millions"='12.75';