I don't think it makes sense to get such figures, especially for permanently banned users (that I guess what you wanted). They already got permanently bans, that mean they will never (almost never) get opportunities to see their permanently bans lifted.
The issue is not figures or getting bans lifted. The issue is about other users knowing whether the profile has been banned or not.
Imagine you wasting time reporting a profile for plagiarism yet it was autobanned 6 months ago... sucks, right?
It could also help with investigations for offenses such as ban evasion (BPIP.org has quite been resourceful for this)