Those figures will be best case scenario.
I have CDR's and CDRW that are unreadable and music CD's from the early 90's that are beginning to rot away.
---------- Post added at 10:24 ---------- Previous post was at 09:35 ----------
Apparently there are places you can go to have your CD's repaired, one shop being GAME.
https://helps.game.co.uk/en/support/...74-disc-repair