While on patrol in North Atlantic in Feb 1942, searching for convoys, decided to pull up losses for 1942. While I was aware of heavy overall losses for the war, seeing it broken down by year, especially seeing how losses were relatively low until 1943, when the numbers grew staggering. Quite sobering.
1939- 9 U Boats lost.
1940- 24 U Boats lost
1941-35 U boats lost
1942- 87 U Boats lost
1943- 244 U Boats lost
1944-249 U Boats lost.
1945- 120 U Boats lost.
https://uboat.net/fates/losses/