In percent, how many more people in Ancona are pensioners than in Italy as a whole?
return Ancona ;return Italy ;return pensioners of #1 ;return pensioners of #2 ;return percent of #3 ;return percent of #4 ;return the  difference of #5 and  #6
['select', 'select', 'project', 'project', 'project', 'project', 'arithmetic']