What is the year range of season 4?
CREATE TABLE "division_i" (
  "no" real,
  "season" text,
  "championship" real,
  "no_of_teams" real,
  "start_reg_season" text,
  "finish_incl_championship" text,
  "top_record" text,
  "national_champion" text
);
SELECT "season" FROM "division_i" WHERE "no"=4;