How many more females were there than males in the York urban area in 2001?
return York urban area ;return #1 in  2001 ;return females in  #2 ;return males in  #2 ;return the  number of  #3 ;return the  number of  #4 ;return the  difference of #5 and  #6
['select', 'filter', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']