When did the Metrostars have their first Rookie of the Year winner?
CREATE TABLE "winners" (
  "season" real,
  "player" text,
  "position" text,
  "nationality" text,
  "team" text,
  "draft_pick_num" text,
  "draft_class" text,
  "college" text
);
SELECT MIN("season") FROM "winners" WHERE "team"='MetroStars';