"Chinese census figures can be taken with a pinch of salt especially in the country areas. T"
All census are incorrect at some level - its the directivity that counts TBH - any way I'm sure they're more accurate then in the lat50's early 60's I can remember a TV Interview with Chou En Lai when has was asked the question. His answer was on the lines of " We 're not absolutely sure. China definitely has less more 500 million people and not more than 600 million but it's very difficult to count them all at the same time"