http://gs.statcounter.com/#browser_version-CN-monthly-201203...
It's under 5%.
On another note, IE7 is probably under 1% in most of the world. IE8 is the new minimum browser for developers?
People using IE6 are unlikely to be heavy web surfers so they are more heavily weighted on the Net application numbers (which ironically Microsoft generally prefers, as it makes IE look more important.)
Since XP has a year left to live and then probably another year or two of stubborn folks after that, IE8 will be with us well through 2015.
The other explanation is that China just pirates really old versions of windows for everything.
Not that strange given the rampant using of pirated Windows XP and the lack of skill and/or will to upgrade.