90%, of labor driving the world economy are carried out by workers in the global South. Any political theory that neglects to center these workers as key agents of revolutionary change is misguided.
Maybe it's about measurement, but also look closer, the change is not 2006, it's 2007. It's when the financial crisis related to the US real estate bubble hit. Also the x-axis is in percent. So it might just be, that the crash hit the regions harder, whose banks had invested most in the bubble: US and Europe. The apparent rise we see might just be production in the global south staying constant, while falling elsewhere.
Also China started huge investments, but I think most of that was at the end of 2008.
Edit: No, I was wrong. Looks like production shifted from medium skilled south to low skilled south. I have no explanation.