There are at last count currently 4 iOS devices for sale (iPad2,HD/iPhone4,4S). Divide 15 by 4 and you will have your answer. Or, throw in a fifth iOS device that while still serviced isn't really selling (iPhone 3GS) and your accounting comes up to 3% per device. Taking that into account, this is a list of devices that were obsolete last year, let alone this year. I wouldn't read too much into this listing. As it is, Android does have the larger share of users. It has been talked about ad naseum for a while. Apple makes a smaller than handful amount of products and of that smaller than handful an even smaller amount that run iOS. The fact it has the massive amount of market share that it does in comparison to Android, based off the amount of devices the OS is on, speaks for itself.