△ - Heya takeover
- Heya closure🞫 - Heya branch-out
- Rikishi transfer from another heya- Click-and-drag across graph to zoom in
- Clicking on data points redirects you to Sumo Reference banzuke page with heya filtered
- Graph on the lighter pink area of the graph (before 1988.03) can be inaccurate since its banzuke contain rikishi with no heya information
- Graph on the darker pink area of the graph (before 1934.05) is mostly incomplete, as many of the lower division ranks are missing