Actually, the % of ships in convoys should increase after the end of 43. The biggest convoys were oddly very early in the war, but they were invasion forces, but there were not all that many of them.
That convoy document is pretty interesting, but it's important to note that the japanese probably had 250-500 merchants at sea any given moment, and the convoys list shoys a small fraction of that number. Most sailed alone.
tater
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