League of Legends Ranked Vs Time Statistics

Is there a website that displays charts similar to the one in the file, but also shows the average time or number of games spent in ranked? I'm trying to study the relation between a player's time spent on League of Legends and his/her rank for an assignment. If there isn't a website, I'll just go in the client and go through divisions while checking # of ranked games won and overall time spent with or .