Drewry Maritime Research said some ship operating costs retreated in 2012, falling by up to 7 percent from 2011 levels, a year when operating costs rose 2 percent to 5 percent depending on vessel sector. Commodity prices have started to fall, particularly in maintenance, and Drewry said 2013 should see further falls. But, in its just-released Ship Operating Costs Annual Review and Forecast 2012/13 , Drewry said cost increases are on the horizon. Paula Pus...