An update on Apple’s developer web page (http://tinyurl.com/oya9tf6) says that iOS 8 is now running on 87 percent of compatible devices.
iOS 7 is running on 11 percent, while all other versions combined account for two percent. iOS 9 is due to be released today. Around this time last year, when iOS 7 was about to be replaced by iOS 8, adoption for Apple’s current-generation operating system is down three points.