Groan...

This plot is extremely depressing.

However, I also noticed something else: Many countries are missing, so my scientific eye automatically makes me wonder whether the data was cherry-picked. How were countries selected to be chosen for the statistical fit? It doesn't change how depressing this plot is, but cherry-picking data really irks me too. (Maybe only these countries were surveyed, but I find that hard to believe.)

(Tip of the cap to Frances Schaeffer.)