Which Year has a Position of 2nd, and Notes of -63kg, and a Venue of manchester?
CREATE TABLE "taekwondo_medals" (
  "year" real,
  "competition" text,
  "venue" text,
  "position" text,
  "notes" text
);
SELECT "year" FROM "taekwondo_medals" WHERE "position"='2nd' AND "notes"='-63kg' AND "venue"='manchester';