Role of narrator, and a Radio Station/Production Company of bbc audiobooks, and a Release/Air Date of 13 november 2008 is what sum of the year?
CREATE TABLE "radio_and_cd_audio_drama" (
  "year" real,
  "role" text,
  "author" text,
  "radio_station_production_company" text,
  "release_air_date" text
);
SELECT SUM("year") FROM "radio_and_cd_audio_drama" WHERE "role"='narrator' AND "radio_station_production_company"='bbc audiobooks' AND "release_air_date"='13 november 2008';