How even is each league?
The effective number of champions is how many equally successful clubs would share the titles the same way: one over the sum of each club's squared share of the titles. A league whose titles all went to one club scores 1; one where ten clubs won the same number scores 10.
Decade by decade
The share of each decade's titles won by that decade's two most successful clubs. Darker means fewer clubs shared the titles. Hover or tap a cell for its champions.
Is football getting more predictable?
The effective number of champions in each league's last 20 titles, title by title, so that leagues with one and two champions a year compare on the same window. Pick up to four leagues.
A value of 2 means two clubs shared the last 20 titles evenly, or one club dominated with a few others; 20 would be twenty different champions in a row.
The longest reigns
The most consecutive titles won by one club in any of the twenty leagues. Where a league crowns two champions a year, each tournament counts.
The most dominant clubs
Each league's most successful club and its share of all the titles the league has awarded.
The newest first-time champions
The last club in each league to win its first title, and how long ago that was.
Every league, every measure
All time, from each league's first recognised champion.