 Since the formation of the Scottish Football League in 1890, statistics show that Rangers and Celtic have been by far the most successful clubs involved.Of the 123 championships played, 105 (85%) have been won by one of the Old Firm with Rangers ahead on 54 titles to Celtic's 51, and 19 between ten other clubs (including a shared title between Rangers and Dumbarton).Although there have been brief periods when silverware went elsewhere - such as Hibernian then Hearts in the 1950s and Aberdeen in the 1980s - there have also been long spells of domination by each Old Firm club, the longest run of 9-in-a-row being first set by Celtic between 1966 and 1974, then by Rangers between 1989 and 1997 and then again by Celtic between 2012 and 2020.