It's low enough to be statistically insignificant. I saw 4 characters in 1e who had rolled psionics (2 at the same table, oddly enough), maybe 2 that I recall in 2e. 3.x I saw two. I never saw any in 4e but I didn't play that edition much.
That's outside of campaign settings where psionics are a prominent feature. In a typical campaign it was almost non-existent.
That's outside of campaign settings where psionics are a prominent feature. In a typical campaign it was almost non-existent.