The line graph illustrates the number of cases caused by x disease in some land from 1960 until 1995.
Overall,the cases remained static until 1965. Then it reached its peak, and then the disease finally vanished in 1995.
To begin with,the number of cases of X disease was 100 in 1960. It remained constant for the next five years. Suddenly,the cases rose to 500 in 1975. For the next 5 years, that is, until 1980, the number of cases in somland showed no change. In 1985, there was a slight reduction in the number of cases (350). Then, there was a sharp fall in the cases, and the X disease was finished completely in 1990. In 1995, there were no cases related to X disease, and hence, some land was disease-free
