How many people saw the 3rd, Central regular season on average?
CREATE TABLE "year_by_year" (
  "year" real,
  "division" real,
  "league" text,
  "regular_season" text,
  "playoffs" text,
  "open_cup" text,
  "avg_attendance" real
);
SELECT MIN("avg_attendance") FROM "year_by_year" WHERE "regular_season"='3rd, Central';