I kind of wish the scale would go out further into history; I'm not sure if something like that exists (maybe for someplace like England or China?). I also would like to see it replicated for different areas of the world, as well as how the trends correlate with one another over time.

The period since the industrial revolution has been anomalous in many respects in terms of population dynamics and public health, and I imagine it would show up somehow in economic trends? On the other hand going back further in time I assume it becomes increasingly difficult to scale things on some common metric.