Almost all bitcoin trading is done in China.
The share of the cryptocurrency that's traded via China's mainland currency escalated over the past few years, overtaking the US dollar as the dominant currency. From less than a 10% share in January 2012, the yuan now makes up nearly 100% of all bitcoin trading.
After china i think almost each country trades with bitcoin. I also heard about some issues with china and vitcoin but im not sure because they were rumors.
The share of the cryptocurrency that's traded via China's mainland currency escalated over the past few years, overtaking the US dollar as the dominant currency. From less than a 10% share in January 2012, the yuan now makes up nearly 100% of all bitcoin trading.
After china i think almost each country trades with bitcoin. I also heard about some issues with china and vitcoin but im not sure because they were rumors.
I think it's really to know, of course it's China 
Why China? Maybe there is more people that trade, but US is country where all the wealth is. I remember a statistic from 2 years ago, US was on the number one place for trading bitcoin and their exchangers has higher volumes then Chinese. Europe is in the game, but still behind Asia.
Chinese exchangers had inspection, government inspection and it was uncertain what decision will they make after they inspect all Chinese exchangers.
Chinese are miners, they are not trader's and it's a big difference between this two things.