"Emerging" economies like China and Russia are going through this strong badware period. Research by StopBadware.org theorizes that lack of economic incentives for Chinese hosting providers and site owners to inform their users of infected sites and/or to take action to clean or remove these sites.
Full report (PDF)
Badware sites per million Internet users: China 689 Russia 307 United States 212 Germany 135 France 128 Republic of Korea 115 Great Britain 60
Via The Register