You should exclude the brand new users from your stats. They are likely to be spam bots that are banned.
That is quite some stat in itself, 73.35% of new accounts got nuked.
Many of them are just "prepared" to start a spam session, I see many Newbies spammers who didn't register recently.
I could pull up exact figures as needed, since I maintain a full list of the modlog.
I'd love to have a full list of all banned userIDs! I've asked to add a "Rank: Banned" before, but it was never implemented.