You are in the Legend Tier. The only way to be certain of the number of qualifying Ranked Rounds you have played is to, from the very beginning, manually track them as you advance (spreadsheet).
You will be able to "observe" when you have hit "satuaration" when you suddenly see your average go down unexpectedly... for example, you have an average of 63.66.... you shoot a 33... and your average drops to 63.26!!! That indicates that you have hit saturation, and the 33 knocked off one of those nasty 39s sitting on the rack.
Good luck as you advance!