Who is the top goalscorer for season 1998-99?
CREATE TABLE "year_by_year" (
  "season" text,
  "champions" text,
  "runner_up" text,
  "third_place" text,
  "top_goalscorer" text,
  "club" text
);
SELECT "top_goalscorer" FROM "year_by_year" WHERE "season"='1998-99';