title: Most current iOS version distribution percentage?
body: <p>I started working on a new app and I wanted to use all of the new iOS5 features (including storyboard) but I'm afraid to limit my app to iOS5 users only.</p>
  
  <p>I couldn't find any information about iOS5 usage VS iOS&lt;5 usage.</p>
  
  <p>If you could point me to some research data or give me an advice about going for iOS5 only development, I would be forever grateful :)</p>
  
  <p>Thanks</p>