Visualization: Migration Between Countries...

Peoplemovin is a well-done interactive visualization that lets you see migration to or from any given country.  For instance, in the clip below I've clicked on the Phillipines on the right, to see where people migrate to the Philippines from. 

There were lots of surprises for me as I browsed around this visualization.  In the example case, I never would have guessed that the top three sources for immigrants to the Philippines were the U.S., China, and the U.K.  I spent about nine months (in several stretches) in the Philippines when I was in the U.S. Navy, way back in the '70s, and I did run into quite a few U.S. military retirees.  I wonder if that's where most of these immigrants come from?