Who was the winning team in the 1989 season?
CREATE TABLE "nsl_cup_winners" (
  "season" text,
  "cup_final_date" text,
  "winning_team" text,
  "score" text,
  "losing_team" text,
  "location" text,
  "cup_final_attendance" real
);
SELECT "winning_team" FROM "nsl_cup_winners" WHERE "season"='1989';