Do funds towards the Reservations go towards that allocation? Quite possibly. I bet that skews the numbers quite a bit.
They are always doing work on the highways here.
Unemployment rate is very low ~ 4.5 % (in my town it's barely over three) so I doubt much money gets pumped into here for that.
Interesting link though, I'd just disagree with the assessment that our state successes are by in large thanks to other states who raise more revenue. The legislatures here at the state level in the Dakota's do a remarkable job with the hand they have been dealt.