In the January-May period this year, the weighted-average purchase costs in China of coking coal, metallurgical coke, domestic production iron ore fines, import iron ore fines and ferrous scrap decreased by 28.53 percent, 28.53 percent, 14.35 percent, 15.66 percent and 14.46 percent year on year, respectively, as announced by the China Iron and Steel Association (CISA).