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I really do not think you are reading what I and others are saying. The whole concept of race is meaningless. Percentages are even more meaningless, to the point of being absurd. However some specific questions:
 What census are you talking about? The US census? The census in many countries does not ask questions about race, because the answers to such questions is meaningless.
 ""We only have 8 choices:"". We do?? Do you have a source that says the human population on earth is divided into 8 races? Earlier, when I raised Melanesians, you said we did not need to worry about races we did not have examples for. Now you say we have 8 choices. References, please, and then add it to the article where the race abbreviations are defined and add the other four.
 What basis do you have for using ""Pacific Islander"", rather than splitting into ""Melanesian"", ""Polynesian"" and so on?   "