Google has released Google Play install statistics which show that Marshmallow is still the most widely used version of Android with a 30.9% market distribution. Oreo comes in dead last—yes, even worse than Gingerbread—with just 0.3%.
https://www.notebookcheck.net/Marshmallow-still-most-popular-version-of-Android-with-31-market-distribution.263720.0.html