This is very interesting to me, although NSF doesn't really cover my field. So far as I know, NIH still does a very poor job of tracking PhDs, and worse than that, we still don't have good numbers on the breakdown and progress of postdocs in the US. Postdoc numbers are much harder to get since non-accredited institutions can have postdocs and are under no obligation to track them the way schools are required to keep track of students. Many places still mix postdocs in several job titles with other staff or students (postgraduate can mean anything; research assistant can too).

I have to wonder how accurate these numbers are, even for PhDs. Does anybody doublecheck them? Did you see the recent blurb about how the National Academies report Rising Above the Gathering Storm made a huge error comparing the number of US science students vs. other countries? They got the numbers reversed and claimed we didn't have enough physicists. Someone apparently noticed and pointed out that we still have more physicists than we have jobs for them.