Your graph should have come out something like this, showing the ozone hole annual minimum value decreasing erratically from just over 200 Dobson units in 1979 to just over 100 DU in 1998:
![[ ozone hole minimum values through time, NASA GSFC ]](http://www.epa.gov/ozone/science/hole/holemin.gif)
Your graph should have resembled this one, which shows the spatial extent of the ozone hole (the 220 "isodobson") growing erratically from about 2 million square kilometers in 1979 to over 20 million square kilometers by 1998:
![[ ozone hole minimum values through time, NASA GSFC ]](http://www.epa.gov/ozone/science/hole/holesize.gif)
Your brief lab report should have stated that the ozone hole is both deepening through time and covering a larger and larger area. This is of concern because ozone in the stratosphere absorbs the more dangerous UV rays, protecting life on the earth's surface from the effects of such short-wave, high-energy radiation.