sentences:  The loss of ships increased sharply as the war went on.In round figures, the total tonnage of Army, Navy, and commercial shipping sunk mounted from year to year; that is, from about 880,000 tons in 1942 to 1,600,000 tons by the next year.The approximate net difference between new construction and losses amounted to minus 460,000 tons in 1942, and to minus 490,000 tons in 1943.