Ha, yes, Allen does go on to talk about how these numbers mirror the general demographic shifts over the past decade or so—actually in the paragraph represented by "[...]," which was my ill-fated attempt to make my excerpt more concise. That said, if you're after satisfying statistical discussion of demographics, I would maybe try reading the study rather than the book; that's definitely not where its strengths lie, and most of the uses of stats are similarly surface-y. :-/

I like the lit-in-translation (and English-language lit from other countries) solution as well; getting back to that was a big reading goal for me this year and so far I'm doing pretty well on it & finding it really rewarding. That said, I also wish it was easier to pick up a book from/about my own country and not have it be yet another story about New York! I had a couple years where I declared a full-on moratorium on NYC stories, because I was just so sick of hearing about it. But the problem is that such a preponderance of books are written (and movies and shows made) about it that just by strength of numbers some of the really excellent ones are going to be among their number. Blah.