Statistics show that Rangers and Celtic have been by far the most successful clubs involved in the Scottish Football League since its formation in 1890. The pair were the only participants in every edition of the competition until 2012, when Rangers were removed from the top tier for economic reasons; they returned for the 2016–17 season. Of the 124 championships played, 106 (85%) have been won by one of the Old Firm with Rangers slightly ahead on 55 titles to Celtic's 51, and 19 between ten other clubs (including a shared title between Rangers and Dumbarton).