CREATE TABLE "league_statistics" (
  "season" text,
  "overall_spectators" real,
  "per_game" real,
  "best_supported_club" text,
  "spectators_game" real,
  "top_goal_scorer" text,
  "goals" real
);

Question: How many season did sportfreunde siegen win best supported club?
SQL: SELECT COUNT("season") FROM "league_statistics" WHERE "best_supported_club"='Sportfreunde Siegen';