Frankly, it doesn't matter whether you believe it or not.
"$35,709 Average starting gross annual salary / stipend
$40,398 Average current gross annual salary / stipend (all PDs)"
It's even worse than I thought - they start at $36k and reach $40k later.
Ug. $33,000 starters for new hires in the gas fields of Oklahoma, if you have experience double that......any Americans up for manual labor yet? Most of the takers are Mexican.....bilingual will get you more.
This isn't a nation-wide survey, nor does it even pertain to math/engineering/physics degrees - which is what the discussion was about.
I can believe that biologists, chemists, and physiologists with a PhD don't make much - because those with a BS in those areas don't make much on average. ($25-30K joboutlook.com again). The survey you posted is weighted heavily in those 3 areas. How about finding a nationwide survey that breaks down the salaries of PhD's according to field? You are finding obscure irrelevant data from a small cross-section and posting it as if it means something.