Right, 32% vs. 18-20%. Which, in hard numbers, is quite a few individuals. Your post said 18-20%, so I figured I'd give you the current estimates for more accuracy. The estimates for upper-class were but 2%.

Probably important: There is some disparity in numbers. A few claimed higher, a couple had lower. Neither was significantly higher or lower, so I went with that one. Interestingly, a frequently listed number was 50% middle class by 2030.

My guess is that the numbers aren't accurately reported, which explains the variations.