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I have wanted to do some statistical analysis on the public database of player rankings for some time, but have been unable to do so because RIOT does not expose any web service for retrieving them programmatically. Well, I finally got around to spidering their rankings page and creating my own personal database.
In order to provide this information to the public, and in order to save RIOT's servers from further hammering (sorry!), here is the database I generated: