CREATE TABLE table_name_36 (division INTEGER, year VARCHAR(255), reg_season VARCHAR(255), playoffs VARCHAR(255))
Which Division that has a Reg Season of 1st, western, and Playoffs of champions, and a Year smaller than 2013?
    
SQL: SELECT AVG(division) FROM table_name_36 WHERE reg_season = "1st, western" AND playoffs = "champions" AND year < 2013