How many fewer US dollars was the Russian military budget in 2014 than it was be in 2015?
return Russian military budgets ;return #1 that is in  2014 ;return #1 that is in  2015 ;return US dollars of #2 ;return US dollars of #3 ;return difference of #5 and  #4
['select', 'filter', 'filter', 'project', 'project', 'arithmetic']