China has always been a nightmare for Bitcoin because it changes its rules regularly but its where all the mining is - however with all thats happening with GMO on the mining front in Japan (and with exchanges migrating to Japan en mass) I would expect them to start to take the lead in the market. Bitcoin really needs this so hang tight!

google:
$90 Million Budget: Japan's GMO Reveals More Cryptocurrency Mining Details

50 Bitcoin Exchanges Have Filed with the Japanese Financial Authority