Globalisation at work.
I'm sampling a few points from the chart and will try to create the corresponding line graph.
The Philippines is indeed dramatically flatter than the others!
I'm not as big a fan of them for software work. For coders, eastern Europe is your best bet, with Brazil picking up a lot of steam in the last few years as well.
Of course, there are other effective ways to provide a real-time worldwide workforce without relying on folks staying up all night. MobileWorks pulls it off by employing trained workers in both hemispheres: for instance, Latin America.
Mechanical Turk is an example of how not to do this – the performance disparity between random US and Indian workers there causes more trouble than it's worth.
There are many software applications today that are being seamlessly powered by a combination of human and machine intelligence. For example, Google Books is mainly digitized with OCR but then ReCAPTCHA is used to bring human intelligence for fixing the mistakes of the OCR process.