A speaker from the Internet Society of China, Mr. Yuxiao Li, just said
that, for Chinese users over the past year (I think he said),
Chinese-language spam received has gone down from 65% to 56%, while
Engligh-language spam is up from 30% to 41% of all mailed
received.  He chalks up this result to strong ISP practices and a
variety of concerted efforts by the Internet Society of China and
others.  Unverified by me but of interest in any event.  (The
“here” is the ITU WSIS Thematic Meeting on Countering Spam.)