What grand prix was held at Granollers?
CREATE TABLE "by_year" (
  "year" text,
  "designated_grand_prix" text,
  "track" text,
  "250_cc" text,
  "350_cc" text,
  "500_cc" text,
  "report" text
);
SELECT "designated_grand_prix" FROM "by_year" WHERE "track"='granollers';