Did fewer people live in urban areas in 1996 or in 2011?
return urban areas ;return people of #1 ;return #2 in   1996 ;return #2 in   2011 ;return number of  #3 ;return number of  #4 ;return which is fewer of #5 ,  #6
['select', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'comparison']