Developer metrics for the month of April have been released. The data released shows the dominance of Android Nougat in the market, with 30% of users being on that version of the OS. Android Oreo still has an utterly woeful market share, coming in at 4.6%.
https://www.notebookcheck.net/8-months-after-the-release-of-Android-Oreo-less-than-5-of-users-have-received-the-update.299362.0.html