The line graph gives information about the number of reported incidents of X disease in a certain area between 1960 and 1995.
Overall, during the period, the X virus spread throughout the area, especially from 1960 to 1980, and its incidence dramatically fluctuated. Although the number of people infected with the virus surged in 1975 and 1980, in comparison, from 1990 to 1995, no cases of X disease were registered in the area.
According to the graph, the X virus began to spread in 1960, then slightly increased to 200 in 1970. Meanwhile, in 1975, the number of people infected with this dangerous virus peaked at 500, and it leveled off in 1980.
The number of incidents reached 400, and it shows that the virus slowly declined. Furthermore, it dropped sharply to 0 in 1990, and the disease remained stable in 1995.