Apple paid $10 billion to app developers in 2014

"Apple paid $10 billion to developers in calendar 2014. Additional statistics for the App store are:
$500 million spent on iOS apps in first week of January 2015
Billings for apps increased 50% in 2014
Cumulative developer revenues were $25 billion (making 2014 revenues 40% of all app sales since store opened in 2008)
627,000 jobs created in the US
1.4 million iOS apps catalog is sold in 155 countries"

Source:  Asymco, 22nd January 2015

Note - Asymco makes the point that $10bn is bigger than US domestic movie box office for 2014 - but it's comparing a global figure with a US-only figure.  (Interesting comparison though)