It all depends on how much the profit will drop or improve in the next six months. Assume they might need to cut equivalent to 2/3 of the percentage drop in profit one way or another. If last quarter's profit dropped 19%, in theory, some teams have to let go of 19% people, while some other teams have a smaller loss.
Can somebody confirm if this is really how it works? Not that it matters that much, I still have the same chance of being laid off, but I am curious if this is how they determine the full number.