This is where FX confuses everyone.
1usd = 7.25 yuan
The whole table is quoted in USD.
Discussion
If you go to the source, they quote it in BTC for you. 
China obviously is a larger market domestically by what 4.5x the population of the US?
Yet our "market size" for USD is around half.
Then you have to take into account cross contamination.
Then you have interesting situations that give China a free pass.