This Sunday jan/26 was rather atypical. Volume was higher than normal in the Chinese exchanges (128 kBTC), especially Huobi, and price shot up by ~200 CNY from 4850 in intense trading, starting at about 22:00 local time. (As everybody noticed, that rally was basically undone today).
Volume was slightly higher tha usual in exchanges outside China, but price rallied there too.
China still has roughly 3/4 of the volume that I can monitor.
People have asked what is the point of these reports. It seems important to compare the volumes, since (all other things equal, and barring major fakery) the higher-volume sites should have more weight in defining the price. Arbitrage trading, for example, should generally have a larger impact on the market with smaller volume.
It would be nice to have more data about the trades than just the volume; but even if the data is out there, I will not have the time to collect it.