The given line graph reveals the X disease incidence in Someland over a period of 35 years ending in 1995. In general, this figure followed a downward trend throughout the latter half of the featured time frame.
As can be seen clearly from the graph, standing at approximately 100 in 1960, this figure increased steadily at 200 in the year of 1970, and then the disease began to spread rapidly in the following years, with the number of patients doubling to roughly 500 in 1975. This figure remained roughly stable at 500 cases for the next five years..
In the next 10 years, there was a sharp decrease in the number of cases, and no reported cases were recognized in 1990. In a period of 5 years, this figure remained constant at zero, which was dramatically lower than the starting point. Someland was free from the illness