Update: I've gone through every anonymous edit made to this site since I deleted my previous account in November 2013 to the time I created my current account (December 2017), and analyzed which ones are mine, in order to provide a full list of all the edits I contributed as an anonymous user. You can find the list here. Altogether, in the year prior to my creating my current account, I contributed 280 out of 305 anonymous edits, or 92% (close enough to my estimate of ~95%), and overall, I've contributed approximately 320.
The last 100 or so edits I made sure to do under the same cookie, so those are (semi-)confirmed as belonging to me (you can click "more" on the edit review task to see that there were 100-something approvals from the same anonymous user). Previous ones are based purely on my (generally good) memory, though you can see some patterns matching in them. I've marked a "Yes" on those that are confirmed through the aforementioned cookie or I remember performing, and an "Unknown" on those I don't remember.