Which Division that has a Reg Season of 1st, western, and Playoffs of champions, and a Year smaller than 2013?
CREATE TABLE "year_by_year" (
  "year" real,
  "division" real,
  "league" text,
  "reg_season" text,
  "playoffs" text
);
SELECT AVG("division") FROM "year_by_year" WHERE "reg_season"='1st, western' AND "playoffs"='champions' AND "year"<2013;