Machspeed is correct but I think another reason for the number of people leaving is the demographics of the hiring over the last few years. Emirates has been hiring more younger people without families of late. That looks great to the accountants because it saves on housing and schooling. However, these people can also leave relatively easily as they don't have to worry about spouses and children. If they get fed up they can quit tomorrow and relocate anywhere in the world much more easily than somebody married with two or three children in school.