title: What percentage of iPhone users using each iOS version
body: <p>I am looking for up-to-date report of iOS versions deployment in percentage. 
  Something like <a href="http://chitika.com/research/2010/ios-4-now-powering-50-of-iphone-traffic/" rel="noreferrer">Chitikia Report</a> but up-to-date.</p>
  
  <p>This info is extremely important for taking a decision of what iOS version to deploy my App...</p>
  
  <p>Any idea where to find that? Is Apple publish such reports for its registered developers?</p>
  
  <p>Many Thanks!</p>