Capital controls

credit-suisse: "All of these features match those in the late 2012-early 2013 period when there were allegations that some of the trade data were affected by falsified trade activity. Based on this circumstantial evidence, we are inclined to believe that a large portion of the recent external trade improvement came from trade fabrication instead of strengthened demand."

Chinese exporters nd importers rig the bids to leave  pile of off shore yuan they can trade.