The line graph illustrates the number of reported cases of X disease in Someland from 1960 to 1995.
Overall, the incidence of the disease saw a significant increase from 1960 to 1980, followed by a sharp decline between 1985 and 1990. By 1990, the disease had almost disappeared and remained at that low level until 1995.
In detail, the number of cases remained stable at around 100 between 1960 and 1965. After that, there was a gradual rise to 200 cases in 1970. The most dramatic increase occurred between 1970 and 1975, when cases jumped from 200 to 500, and this figure remained constant until 1980.
However, after 1980, the number of cases began to fall, dropping to approximately 350 in 1985. The most notable decline happened between 1985 and 1990, when cases plummeted to almost zero. From 1990 to 1995, the incidence of the disease stayed extremely low.