These images show the size of the ozone hole over Antarctica in 1979 (the first year ozone satellite images were available), 1993 (a “mid” year), and 2006 (the worst ozone hole ever recorded). Though the 1979 image might not be “normal,” since CFC-driven depletion had already begun, ozone levels are considerably higher than in subsequent years. The 1993 image shows a much larger ozone hole than that in 1979, but the record ozone hole of 2006 is wider and deeper (indicated by the purple color—lowest ozone levels ever recorded).
NASA