Apple's App Store generated $20 billion for developers in 2016

(Reuters) - Apple Inc said on Thursday its App Store generated $20 billion for developers in 2016, a 40 percent increase from 2015, helped by the popularity of games such as Pokemon Go and Super Mario Run and increased revenue from subscriptions. App Store sales topped more than $3 billion in December, helped by the launch of Nintendo Co Ltd's Super Mario Run, which was downloaded more than 40 million times in the first four days after its launch. Nintendo's Pokemon Go was also the most download