What year had a score of 0.586?
CREATE TABLE "international_recognition" (
  "index" text,
  "score" text,
  "palop_rank" text,
  "cplp_rank" text,
  "n_africa_rank" text,
  "world_rank" text,
  "year" real
);
SELECT COUNT("year") FROM "international_recognition" WHERE "score"='0.586';