Why is there such a disparity in Chinese gold demand estimates?

Be all this as it may SGE gold deliveries so far this year have been enormous and are running at record levels – 1,658 tonnes for the year to date, equivalent to around 80% of global production of new mined gold on its own. This is a big new record for SGE gold flows running nearly 200 tonnes higher than in the record 2013 year at the same time and around 450 tonnes higher than at the same time a year ago.

Why is there such a disparity in Chinese gold demand estimates?