How many more inhabitants did Ashkelon have in 2005 than in 1955?
return Ashkelon ;return inhabitants of #1 ;return #2 in  2005 ;return #2 in  1955 ;return number of  #3 ;return number of  #4 ;return difference of #5 and  #6
['select', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']