During which years was the Model 318td (diesel) with the Engine code of m47d20 manufactured?
CREATE TABLE "engines" (
  "model" text,
  "years" text,
  "engine_code" text,
  "power" text,
  "torque" text
);
SELECT "years" FROM "engines" WHERE "engine_code"='m47d20' AND "model"='318td (diesel)';