Official App Developer wage statistics, including both mean and percentile, in the US (for 2014) can be found here:
<a href="http:&#x2F;&#x2F;www.bls.gov&#x2F;oes&#x2F;current&#x2F;oes151132.htm" rel="nofollow">http:&#x2F;&#x2F;www.bls.gov&#x2F;oes&#x2F;current&#x2F;oes151132.htm</a><p>For generic Programmers, see here:
<a href="http:&#x2F;&#x2F;www.bls.gov&#x2F;oes&#x2F;current&#x2F;oes151131.htm" rel="nofollow">http:&#x2F;&#x2F;www.bls.gov&#x2F;oes&#x2F;current&#x2F;oes151131.htm</a><p>TL;DR: Programmers = ($44k to $128k); App Devs = ($56k to $149k);<p>PS: Sorry about not answering the actual question, but I thought this would provide some background to the discussion.