When the city is agadir what is the change (12/11)?
CREATE TABLE "2012_statistics_at_least_1_000_000_passe" (
  "country" text,
  "airport" text,
  "city" text,
  "2012" real,
  "change_12_11" text
);
SELECT "change_12_11" FROM "2012_statistics_at_least_1_000_000_passe" WHERE "city"='agadir';