Apple’s big press conference in San Francisco is now underway and while brand new iPad and iPad mini tablets will be the stars of the show, Apple always kicks things off by sharing some impressive numbers that help put the company’s performance in perspective, and Tuesday’s iPad event was no different. This time around, Apple CEO Tim Cook got the show by announcing that Apple’s iOS 7 software is installed on more than two-thirds of all iOS devices currently in use. Cook also said that more than 20 million people have used iTunes Radio thus far, having streamed more than 1 billion songs to date. Where Apple’s App Store is concerned, the company has now paid out more than $13 billion to developers.