Apple has confirmed that 75 percent of devices running on iOS are now on its latest mobile operating system – iOS 9.

The iPhone 6s and the iPhone 6s Plus were the first to come pre-installed with the new OS, while Apple rolled out the same to its older devices in September 2015.

According to a chart published by Apple, 75 percent of iOS devices are running on iOS 9, 19 percent on iOS 8 and 7 percent on earlier versions of the Apple mobile operating system. The App Store measured the data on Monday.

iOS 9's share includes iOS 9.1 and iOS 9.2. The OS has only been in the market for less than four months, this makes the adoption rate relatively quicker than iOS 8, which took about six months to reach the same milestone.

iOS 9 adoption rate has been increasing at a constant pace. On Sept. 19, 2015, just three days after the release, the adoption rate of iOS 9 was already 52 percent; this made Apple announce that iOS 9's adoption rate was the fastest ever.

"iOS 9 is also off to an amazing start, on pace to be downloaded by more users than any other software release in Apple's history," said Philip Schiller, Apple's senior vice president of Worldwide Marketing.

In early November 2015, the adoption rate for the latest iOS version reached 66 percent and iOS 8's share declined to 25 percent.

According to Apple, the iOS 9 is the most advanced OS in the world. The latest OS brings improvements to existing features and also adds new features to enhance the overall experience of users.

"iOS 9 is full of enhancements you'll appreciate every day. Your apps become more essential. New multitasking features on iPad make you even more productive. Siri can do more than ever, and new proactive suggestions help you get things done before you ask. And improvements at the foundation of the operating system enhance performance, battery life, and security. The more you do with iOS 9, the more you'll wonder how you ever did without it," says Apple.

Android and iOS run on the largest chunk of all the smartphones in the world. Android also released its new mobile OS, Android 6.0 Marshmallow, in October 2015, which has been rolled out to some Nexus devices and a limited number of non-Nexus devices. However, the market adoption rate of Android's latest OS remains very low.

According to Google's developer website only 0.7 percent of all Android devices are running on Android 6.0 Marshmallow.

The data also show that the majority of all Android devices, with a 36.1 percent adoption rate, still run on Android 4.4 KitKat, followed by Android 5 Lollipop that has a total adoption rate of 32.6 percent (Android 5.0 - 16.9 percent and Android 5.1 - 15.7 percent).

Google collected the data during a seven-day period that ended on Jan. 4, 2016.

Apple has announced that it will roll out iOS 9.3 soon, which will bring even more new features. The company hopes that iOS 9 adoption rate will continue to increase with the upcoming release of iOS 9.3 in the near term.

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