Well, at least your referencing the $209 mil box now. But claim that somehow IMDB is contradicting itself by offering more up to date box info for a fee? Absurd. But the gross doesn't stop at $209mil. There's more international territories (incl Japan) to finish their run and then:
DVD Blu-ray sales rentals pay per view netflix TV licensing deals for paid cable Network premiere deal merchandise
This movie will make a lot more money. And has already made $40 mil more than your most recent article claims. There is no general rule of thumb, but when it's all said and done, it probably will gross double it's budget.