Does anyone know the national average number of Americans that will study philosophy in their lifetimes?

I'd like to know if my colleagues have any better information than I do. The best I have to offer is a not very reliable guess based on limited information. There is a graph at which, when extrapolated, leads to the estimate that perhaps as many as 70% of people in the USA who have a high school diploma will have at least some college education. And what's posted at claims that 85% of adults 25 and over have a high school diploma. This suggests that perhaps about 64% of people in the US will have at least some college education -- a figure that I seem to recall being consistent with something I read elsewhere. But to complete our guesswork, we need an estimate of the percentage of people among those with at least some college education who take a philosophy course. Here I have nothing to offer but instinct. And my guess is that it is no higher than 20% and quite possibly considerably lower. Putting all this together, my upper bound would be 12% to 13%. If asked not for a maximum but for my best specific estimate, I'd put the figure quite a bit lower, but all that is worth little more than the pixels on your screen.

Anyone have anything closer to real information?

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