Since it is clear that you don't know anything about the ozone layer, it is clear that you don't know whether the protocols have done anything.
Let me see if i can make this easy to under stand...for starters lets start with an analogy...the ocean, the surf, and the beach. The area where the ocean meets the beach is called the surf, and in the upper atmosphere, the area where the sunlight meets the air is termed the ozone layer, because in that region ozone is produced as a result of the UV acting breaking O2 molecules into O molecules some of which reform into O3 molecules,
The surf is a result...it doesn't protect the land from being flooded by the ocean, just as the ozone layer is a result. it is there as a result of harmful UV being dissipated by breaking O2 into O...Some of the O molecules then reform into O3. Ozone is a result, not a cause.
O3 is the result of the photo-chemical process between oxygen and UV light. But it is the photo-chemical process itself which protects us; the ozone is a mere by-product.If you could snap your fingers and make every single last molecule of ozone disappear, it would have absolutely no bearing on the amount of UV light reaching the Earth. The ozone layer would "recharge" for lack of a better word as soon as the next UV radiation was expended breaking down O2 molecules...some of which would then reform onto O3...this process would take milliseconds.
Now that you know how O3 is formed, there are two places on earth where the angle at which incoming solar radiation is oblique and much of it reflects off into space, and there is little oxygen being moved to the upper atmosphere by warm rising currents...Not much incoming solar radiation and not much O2 for what does make in into the atmosphere to break down into O some of which then would reform into O3.
The "holes" vary in size from summer to winter over each pole with them being larger during each respective winter...and the "hole" is always larger over the south pole because it receives less solar energy than the north due to the tilt of the earth.
So what did the protocols do?