How many seasons did the canterbury bulldogs (8) win?
CREATE TABLE "1998_present_national_rugby_league" (
  "season" real,
  "grand_final_date" text,
  "winning_team" text,
  "score" text,
  "losing_team" text,
  "location" text,
  "gf_attendance" real,
  "clive_churchill_medal" text
);
SELECT COUNT("season") FROM "1998_present_national_rugby_league" WHERE "winning_team"='Canterbury Bulldogs (8)';