The two line graphs provide an overview of the variation in the ozone hole size over the Antarctica region as well as the amount of three damaging gases to the Ozone layer which were produced during the period from 1980 to 2000.
As can be seen from the line graphs, it is clear that the size of the ozone hole tended to increase considerably over the research time, from a smallest size of about 300 thousand square kilometers in 1980 to approximately 3.500 thousand square kms in 2000. Additionally, there was an only downward trend in the 1990s, but this figure climbed dramatically after 1993 and in 2000 it reached a peak.
The second line graph shows the quantity of three gases that caused damage to the ozone layer in the same period. Particularly, in 1980, the figure for CFC-11 was produced roughly 70 million tonnes, and remained unchanged for two years later. However, over the following 18 years, the amount of CFC-11 gas steadily declined to below 10 million tonnes in 2000.
Another impressive transformation was the apparent increase in the production of CFC-12. In detail, within the research duration, CFC-12 showed an upward trend going from about 25 to 50 million tonnes. Especially, N2O was not produced until 1990, but its production rose sharply to nearly 40 million tonnes in 2000.