How many more households had females with no husband present compared to a male with no wife present, by percent?
return households ;return #1 with females ;return #2 with husband ;return #2 besides  #3 ;return #1 with males ;return #5 with wife ;return #5 besides  #6 ;return percent of #4 ;return percent of #7 ;return difference of #8 and  #9
['select', 'filter', 'filter', 'discard', 'filter', 'filter', 'discard', 'project', 'project', 'arithmetic']