The two line graph provide an overview of the variation of the ozone hole size over Antarctica region as well as a mount of three damaging gases to Ozone layer which are produced during the period from 1980 to 2000.
As can be seen from the line graph, it is clear that the size of the ozone hole tended to increase considerably over the research time, from smallest size of about 300 thousand square kms in 1980 to approximately 3.500 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 show the quantity of three gases caused damage to ozone layers in the same period. Particularly, in 1980, the figure for CFC-11 was produced roughly 70 million tonnes, and remained unchanged in 2 years later. However, over he following 18 years, the number of CFC-11 gas steady declined to below 10 million tonnes in 2000.
Another impressive transformation was the apparent increase of the production of CFC-12. In detail, within the research duration, CFC-12 showed an upward trend went from about 25 to 50 million tonnes, surpassing the production of CFC-11 gas in 1989. Especially, N2O was not produced until 1990, but its production rose sharply to nearly 40 million tonnes in 2000.