How many more percentage points of the male population was literate than the female population in 1991?
return the  male populations ;return the  female populations ;return #1 in  1991 ;return #2 in  1991 ;return #3 that are literate ;return #4 that are literate ;return percentage of #5 ;return percentage of #6 ;return the  difference of #7 and  #8
['select', 'select', 'filter', 'filter', 'filter', 'filter', 'project', 'project', 'arithmetic']