How many more percent were in the largest group compared to the smallest ancestry group?
return ancestry groups ;return size of #1 ;return #1 where #2 is highest ;return #1 where #2 is lowest ;return percent of #3 ;return percent of #4 ;return difference of #5 and  #6
['select', 'project', 'superlative', 'superlative', 'project', 'project', 'arithmetic']