Not really, at least it’s not available publicly. Reports are not typified, so even quantifying by categorization involves a lot of manual work, which I doubt is going to be performed.

There is an old thread on ban appeals (see https://bitcointalk.org/index.php?topic=5144410.0) which shows many cases appealing due to plagiarism, but the view is completely skewed, since normally only accounts with a certain rank appeal and have an option to reverse the situation (very thin though, it at all).

Bear in mind that plagiarism could crop up at any time, so a Legendary, for example, could be banned now for what he did as a Newbie, if caught.