I just finished reading The Naval War against Hitler, by Donald Macintyre. On page 445, Vice-Admiral Ruge, a distinguished German writer on naval affairs said: Between August 1944 and April 1945, the 250 plus ships on the Arctic run carried over 1,000,000 tons of war material. The weapons, equipment, and vehicles allowed the Russians to equip 60 motorized divisions which gave them not only a numerical but a material superiority at focal points of the battles. Thus the Anglo-American sea power also exerted a decisive influence on the land operations in Eastern Europe.
That pretty well sums that up.