As the whole point of Quantitative Easing and the government stimulus was to raise output and employment (because, for those who have not noticed, we have almost 14 million citizens looking for work), there is no reason to maintain the assumption of zero changein the quantity of goods.
The fact that a 21 percent increase in the value of the Yuan was met with a 38.7 percent increase in import value means that the quantity of Chinese imports demanded increased by nearly 15 percent after the price change.