The line graphs represents the information about the size of the ozone hole over Antarctica and the emergence of three ozone deteriorating gases over the span of two decades. The data is calibrated in thousand square kilometer and million tonnes.
Overall, it is clearly evident that the size of the ozone hole has increased considerably over the years. In addition to it, CFC-12 and N2O gases have made an extensive damage to ozone layers.
To begin with, the measurement of ozone hole over Antarctica in 1980 was recorded at 400 square km. In fact, the size kept increasing till 1990 at around 2000 square km. Notably, from 1991 to 1993, the size reduced to 1000 square km. However, post 1993, the area of the ozone hole inclined at a rapid number and reached its zenith nearly 3500 square km in 2000.
Furthermore, a chemical compound gas namely CFC-11 was considered to be the most damaging gas to ozone layer. It recorded a static damage of 70 million tonnes from 1980 to 1985. Interestingly, this gas showed no further damage till 2000 and showed a declining threat. However, CFC-12 recorded a persistent depletion from 1980 till 2000 where it was at its apex at 50 million tonnes. Although, N2O chemical gas propounded in 1990 increased abruptly and did damage of about 30 million tonnes in a short duration of 10 years.