Apple App Store sales are estimated at $15 billion for 2014, increasing by 50% from 2013. Apple says it has directly or indirectly created one million jobs in the U.S., with two thirds of this in software development by developers to run programs on iPhone, iPad and iPod. The App Store opened in 2008 after the introduction of the iPhone in 2007. Other jobs created by Apple are the 300,000 working at parts and materials suppliers, or construction workers at Apple facilities. Apple employs directly 66,000 workers in the U.S., with 30,000 of this in retail stores.