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.