How many more percents of the counties ancestry were Germans compared to Irish people?
return the  county ;return people of #1 ;return #2 with German ancestry ;return #2 with Irish ancestry ;return percent of #3 ;return percent of #4 ;return the  difference of #5 and  #6
['select', 'project', 'filter', 'filter', 'project', 'project', 'arithmetic']