tons 478,696 235,426 82,386 74,631 1893ton450 , 9221 , 784 , 878 , 4 ton450 , 9221 , 784 , 878 , 4 450 , 9221 , 784 , 878 , 4 221 , 784 , 878 , 4 84 , 878 , 478,4