How many more immigrants did Montreal gain between 2013 and 2014 than they lost to other provinces?
return Montreal ;return immigrants gained of #1 ;return #2 between 2013 and  2014 ;return immigrants lost to other provinces of #1 ;return #4 between 2013 and  2014 ;return number of  #3 ;return number of  #5 ;return the  difference of #6 and  #7
['select', 'project', 'filter', 'project', 'filter', 'aggregate', 'aggregate', 'arithmetic']