This is largely due to China itself. My last posting abroad was in China, and I dealt with a lot of adoption there. That trend started at least a decade ago. It has more to do with the number of children being put up for adoption in China than anything else. It's not a phenomenon unique to Canada—it is true of all adoption from different countries. Is it going to continue? It's hard to tell, actually.
On December 14th, 2010. See this statement in context.