You can't just use percentages for this kind of thing.
Barring a very good cause that the vast majority of the population can get behind, there will be riots when the bananas and coffee disappear.
We grow enough in our garden that I could probably reach "100%" pretty easily if shit hit the fan, but I'm about tired of eating radish greens right now even that being related to a national crisis.
In the case of something like a world war, which is the type of scenario we're talking about here, I think people would begrudgingly accept that bananas and coffee are unavailable or very expensive.
People substitute very quickly and happily.
I remember food shortages during Covid. Nowhere near as bad as toilet paper shortages.
I can go without chocolate for a few days. Weeks, maybe. But if it becomes months, I get crabby.
I'll die before I go without my curvy yellow lumps of mush.
I've heard it usually takes at least an acre to grow enough food to feed a single family.
Feeding a family on an acre is a bit like making pencils one at a time.