The line graph gives information about the figure for cyclones worldwide, including 3 levels of severity: mild, bad and severe from 1975 to 2000. Overall, the number of both mild and bad levels fluctuated over the period, while there was a steady increase in the severe category that decreased in the final year.
Looking at the mild line, in 1975 the number of cyclones was nearly 100 times, after 5 years, there was a slight decline to 82 times. Between 1985 and 1995, cyclones worldwide had a minimal fluctuation from 90 then dropped to 88 and grew minimally by 5. However, in 5 years later, the figure recorded, decreased to 50, exactly 80 times.
In terms of the bad line, at the beginning, the percentage of cyclones was 50%, in 1980, a remarkable fall was recorded in the number of cyclones. In the next 5 years period, there was an upward trend, starting at 40%, later increasing steadily to 50%. Nevertheless, in the included year, it was dropped by 7%, around 43 times.
Finally, the severe category in the first years was under 20 times, then increased moderately and remained in the 20 years period, peaking at 28 times. In the ended year, the proportion of cyclones with severe level witnessed a gradual decline, reached highly 20%.