21% native American :O
I found this out after doing extensive readings regarding race, and that led me to the three major races:
Negroids, Caucasoids and Mongoloids
I also developed a skin color scale ranging from 1.0-10.9, based on Eumelanin(brown-black and pheomelanin(red-yellow), and I figured out that I'm an exact 5.
I thoroughly examined my skull for hours, using the diagrams from wikipedia:
http://en.wikipedia.org/wiki/Negroid
http://en.wikipedia.org/wiki/Caucasoid
http://en.wikipedia.org/wiki/Mongoloid
And determined the following:
Negroid -> Typical(sub group)
Mongoloid -> Northern(sub group)
Caucasoid -> Noric(prodominately)(sub group)
Lower Chin, Caucasoid
alveolar(teeth, and bone supporting them), Negroid and Mongoloid
Upper Chin, Negroid
upper jaw, Negroid
Nose/Nose related Cavity, Caucasoid and Negroid
brow ridge, Mongoloid and Negroid
eye socket/area surrounding it, Caucasoid and Negroid
upper cranium, Mongoloid and Caucasoid
After going through a rigorous system, I determined that I'm 50% black, 29% white, and 21% Native American (roughly), alright!
Amazing how much a skull can teach you!