Xiong Yan the Younger of the house of Mi ruled from what year?
CREATE TABLE "vassal_states" (
  "state" text,
  "type" text,
  "name" text,
  "title" text,
  "royal_house" text,
  "from" text
);
SELECT "from" FROM "vassal_states" WHERE "royal_house"='mi' AND "name"='xiong yan the younger';