Which years have a Decile of 4, an Authority of state, and a Name of mapiu school?
CREATE TABLE "waitomo_district" (
  "name" text,
  "years" text,
  "gender" text,
  "area" text,
  "authority" text,
  "decile" real,
  "roll" real
);
SELECT "years" FROM "waitomo_district" WHERE "decile"=4 AND "authority"='state' AND "name"='mapiu school';