China's GDP

This graph is from The Economist.  For years, I've been teaching the expenditures model of calculating GDP.

The expenditures model says that GDP = Consumption + Investment + Government spending + Net eXports.  I have been teaching that China's Yuan is cheap relative to the dollar so exports fuel China's growth.

If this graph is correct, Investment, not exports are responsible for GDP growth.  I'm not sure if Government spending isn't included in Investment.  China's growth is over 8%.  In the US, the growth is about 2.5%.