China’s export profits have been declining since the 2008 stock market crash, and have not yet recovered, as these charts of total exports minus total imports show. The monthly data is erratic, but as the time span extends from monthly, to quarterly, to semi-annual to anual; the picture become more clear.
It appears that most of their big gains occured in a few years before the stock market crash. An important question is whether that was an anomoly or something that can be recaptured.
The data was provided by the U.S. Federal Reserve based on data they received from the IMF.