CareerXroads’ (CXR) 8th Annual Source of Hire (SOH) study was published in Feb, 2009, which provided a detailed description about how one group of corporations fills their open positions (in the US/North America). Or, more accurately, how corporate staffing functions measure and report sources of hires for the openings they fill. Even the data were collected only for US/North America, but I believe it's also a strong reference for China.
Next Generation Sourcing Channels
Forty-three percent of global executives recently surveyed report that talent sourcing is a moderate to severe challenge, making it a top risk factor in achieving high performance for their organizations. Source: “The High-Performance Workforce Study 2006,” Accenture Research Report