how does that stack up comparing those from Carribean, Latino, and African countries?
My remembrance is that it does, but the data is weak from those countries.
For more detail on how a state (or nation) can outperform another in every ethnic category while doing more poorly overall, may I recommend this classic from the great Iowahawk?
http://iowahawk.typepad.com/iowahawk/2011/03/longhorns-17-badgers-1.html