Let’s say Iraq revalued their currency clear up to a dollar. They’d be going from 1500 dinar that equals one dollar clear up to 1 dollar. That is over a thousand percent increase. That type of large rate change has to be coordinated and timed with the budget fiscal period…small rate changes can happen any time. Large rate changes that will impact the value of the currency that the budgets are calculated off of…have to be timed and coordinated with the timing of a fiscal period.