If the regulations put in place to control the emission of these chemicals have succeeded in reducing the damage to the ozone layer.Has the size of the hole in the ozone layer changed in recent years?

Unfortunately the answer is No.

Formation and depletion of the ozone is  a natural process and we can not control it.

What all we can do is to reduce the uses of CFC which are responsible for ozone hole.The problem is that the Cl radical which is released from CFC is responsible for the hole and while doing so this radicle is not consumed during the reaction and gets regenerated. In this way one Cl radical can destroy millions of ozone molecule. There are already a large amount of Cl radicals  in the stratosphere which are causing regular damage to the ozone layer and hence the ozone hole is not reducing even after putting so much regulations on uses of CFC.