The line graph gives information about how many incidence of X disease appeared in Someland from 1960 to 1995.
To begin with, this incidence started just below 100 cases and rose slightly to reach about 100 cases in 1965. Then, in the next 5 years, the figures increased significantly as nearly doubled of about 200 cases. This was followed by another increase, although much steeper, in 1975 when the incidences were almost 300 cases higher than in 1970 and reported remainly stable until 1980. However, this upward trend was suddenly broken and cases plummeted dramatically over the next 10 years. Finally, in 1990 and 1995, the X disease in Someland was reported with zero case.
Overall, X didease in Someland dissapeared at the end of the period despite violent fluctuations throughout the period. Besides, they were at their highest in 1975 to 1980 while the weakest cases figures could be observed in 1990 to 1995.