X Desease (exercise 13)

There is an interesting point when we see this graph. In  1983, X desease had only in the number of 100 patients. In 9 years, it had reduction to zero. Althoough the number of patients boomed to 400 patients in 3 years, it dropped to 350 patients. In those years there was a fluctuation. This case had a same situaton when the number of patients had a levelling out  in 1983 to 1985. Its number was only  100 patients. After having a little rise in 1985 to 1987 that got 200 patients, it decreased to be 100 patients in 1988.