| U.K. | U.S.A. | Germany | Italy | Japan | |
| 1939 | 1 | - | 9 | - | - |
| 1940 | 24 | - | 23 | 20 | - |
| 1941 | 11 | 1 | 35 | 18 | 3 |
| 1942 | 20 | 7 | 87 | 22 | 19 |
| 1943 | 14 | 17 | 237 | 24 | 23 |
| 1944 | 6 | 20 | 242 | - | 56 |
| 1945 | 1 | 8 | 151 | - | 29 |
| Total | 77 | 53 | 785 | 84 | 130 |
| U.K. | U.S.A. | Germany | Italy | Japan | Total | |
| Air attack | 4 | 6 | 290 | 9 | 14 | 323 |
| Surface attack | 28 | 16 | 246 | 34 | 70 | 394 |
| Mine | 12 | 7 | 25 | - | 4 | 48 |
| Submarine | 5 | 1 | 21 | 14 | 25 | 66 |
| Air & Surface | - | 7 | 48 | 5 | 8 | 68 |
| Rammed | 2 | - | - | - | - | 2 |
| Bombed in harbor | - | - | 62 | 2 | - | 64 |
| Other & unknown | 26 | 16 | 93 | 20 | 9 | 164 |
| Total | 77 | 53 | 785 | 84 | 130 | 1,029 |
Notes:
(1) Air attack for U.K. and U.S.A. from bombs only, all others from bombs and torpedoes.
(2) Surface attack for U.K. is from gunfire (1) and depth charge (27); for U.S. is gunfire (2) and depth charge (14); all others from both.
Source: John Ellis, The World War II Databook.