How many percent more was the African American population over whites and Native Americans?
return African Americans ;return whites ;return Native Americans ;return percent of the  population of  #1 ;return percent of the  population of  #2 ;return percent of the  population of  #3 ;return sum of #5 and  #6 ;return the  difference of #4 and  #7
['select', 'select', 'select', 'project', 'project', 'project', 'arithmetic', 'arithmetic']