When was construction completed that was listed on 09/21/1984 and a Deleted of 11/04/1999?
CREATE TABLE "superfund_sites" (
  "cerclis_id" text,
  "name" text,
  "county" text,
  "proposed" text,
  "listed" text,
  "construction_completed" text,
  "partially_deleted" text,
  "deleted" text
);
SELECT "construction_completed" FROM "superfund_sites" WHERE "listed"='09/21/1984' AND "deleted"='11/04/1999';