Clarification.
From the University of Cambridge Centre for Atmospheric Science.
Dramatic loss of ozone in the lower stratosphere over Antarctica was first noticed in the 1970s by a research group from the British Antarctic Survey (BAS) who were monitoring the atmosphere above Antarctica from a research station.
Further reading confirms they have no data to support or deny the existence of a hole in the ozone prior to the 1970s.
They do have about 40 years of data that shows the size of the hole fluctuates, but an honest answer is they still lack data that conclusively proves man made the holes in the first place.
Since being found in the 1970s the size of the holes, North Pole and South Pole, have fluctuated, but have generally remained stable since the 1980s. There are scientists who are now saying that CFCs may take up to 50 more years to clear from the atmosphere and the holes permanently close.
It is convenient that they pushed it out far enough that all of them will likely be dead by the time anyone could say they were wrong.
The data accumulated does confirm the size of the holes is seasonal which suggest a natural phenomenon.
