The adoption rate of iOS 9 appears to be stalling at 77 percent of devices, according to the most recent stats published on Apple's dashboard for developers. The figure was derived from device logs capturing iOS hardware that has accessed the App Store on February 22, and is literally unchanged from the same 77 percent mark recorded two weeks ago.
iOS 8 continues to comprise seventeen percent of devices while older editions of iOS accounted for six percent of devices—again, same as two weeks ago.