I'd love to learn what the real Chinese market volume is.
it certainly is more than western exchange's volume but not by the current amount they are reporting.
it is more only because of a couple of reasons. the most important reason is that they have 0 fee for trades which makes any kind of trade profitable.
also the other reason is that Chinese are known to be traders, and there are lots of them who are trading and that makes a bigger volume.
with that said i say it is only 20% more!
I think "only 20%" may be a little off. Take a look at the "volume" column.