We can't know the exact number. Some cases could be settled before a formal complaint. The problem is that in cases such as this a non-disclosure requirement is part of the settlement. You only get the money if you keep your mouth shut forever. Sometimes details leak out but there must be extreme sanctions for disclosing the details of the agreement.
I am certain there have been many more cases. Perhaps hundreds or thousands. The Conti jury award was so publicized that it will move some who feel shame to sue. Now they know that they are not alone. Furthermore, a jury of worldly people found such conduct worthy of heavy punitive damages.
I expect this is a cost of doing business. You also need facts that hold the WT liable in addition to the pedophile.
I read the book of Victim No. 1 with the Sandusky case. No one had any clue that hundreds were involved. One victim's courage usually leads to hundreds of cases being disclosed. The WT has no shame.
The Roman Catholic Church has modified its policies. The WT appears to be even more entrenched.