In 2016 how many more neighborhood markets than supercenters did Walmart open?
return Walmart ;return neighborhood markets that #1 open ;return supercenters that #1 open ;return #2 In 2016 ;return #3 In 2016 ;return number of  #4 ;return number of  #5 ;return difference of #6 and  #7
['select', 'project', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']