As Bernardo says, it is encouraging. But the fact that lower deciles have less people in the top universities is not surprising… It is not a matter of fairness, there are so many variables that might influence the probability of getting admitted to an ivy league. For example, people from higher deciles usually have better educated parents who educated better (in academic terms) their sons. They could also have been exposed to situations that raised their analytical skills more often than the poor, like conferences, traveling, access to books, etc. Malcolm Gladwell wrote an interesting chapter about his on his book Outliers.
As a footnote, I think that the Ivy League is trying to give more opportunities. People from Africa are not expected to excel on their GREs, for example.