Checking your privilege: a few statistics and graphs about types and tiers

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I have made a few graphs showing the relationship between the pokemon types and tiers. They can be found here:

https://onedrive.live.com/redir?resid=B45EAEE46513E2B1!852&authkey=!AOFvCSuP-_eZIcw&ithint=file,xlsx

or you can see them in the attached file:

Tell me what you think about this data and to what it suggests.