There is a brief summary article by Yu Tongzhi (Judge, Beijing Higher People’s Court, PR China) in a 2008 “China country report” UNAFEI RESOURCE MATERIAL SERIES No.74. This suggests that around the mid 2000's rates had increased [3-4 year follow-up] from about 5% in the 1980s to about 14%. A limitation for me is that I don't read Chinese and so it is possible more rigorous studies are available in Chinese journals. 

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