I never imagined they would be selling outside of China since China is an importer of fertilizer. The information from the website below is a little dated.
'Within China, phosphate rock consumption has grown significantly since 2003, at an estimated compound annual growth rate of 14%. In addition, China consumes nearly all of its phosphate rock production, with very little in the way of imports or exports (though as stated above, they are a net exporter of DAP)."