About only 1%...I haven't really bought a lot of anal toys. The toys I do own, which are a lot of glass toys, are anal safe, so I've used those. I only own one set of plugs, and they're a beginner set.
Out of 15, 3 are toys that I only use for anal. I do use most of my other insertable toys for anal from time to time, usually to warm myself up for a bigger toy, even though most of them don't have a flared based (I know I shouldn't, but I'm always sure to keep a tight grip on whatever I'm using)