Here’s a statistics that surprised me:

http://www.chinadaily.com.cn/china/2006-11/10/content_729312.htm

“Currently, Guangzhou has 372,631 one-child families, about 15 per cent of the total.”

Only 15%? Does this number commensurate with rest of China? US, having no family planning law, has about 18% of families with only child.