UPDATE 1-Yuan in biggest yearly loss on record after volatile 2015

(Updated closing prices and graphic) SHANGHAI, Dec 31 (Reuters) - China's yuan weakened against the dollar on Thursday, finishing the year with a record yearly loss of 4.7 percent after volatile trading in last five months. A big question in global currency trade for 2016 is how much further the yuan might depreciate. Still, the Chinese currency has posted comparatively smaller losses against the dollar than other global currencies. (http://link.reuters.com/tak27s) "We believe