The line graph illustrates the cases of an unknown illness, referred to as ‘X illness,’ in Someland from 1983 to 1992.
Overall, the graph shows significant fluctuations before declining to its lowest level by the end of the period. The highest number of cases occurred in 1989, while the lowest figures were recorded in 1992.
In 1983, the number of cases was 100 and remained relatively unchanged over the next two years. The cases then saw a significant rise to 200 before returning to the original level observed in the initial years. In contrast, there was a sharp increase to 400 over the next six years, reaching the peak in 1989. A slight increase was noted in 1991, with the number of cases rising to about 350, after which the figures dropped steeply by the end of the year.