The graph below gives information about the progress of certain diseases during childhood between 1950 and 2000 in a developing country

As can be seen from the bar chart that, the progress of certain diseases during childhood between 1950 and 2000 in a developing country.
It will be more comfortable to explain the chart, If I separate into two periods. they are from 1950 to 1970 and from 1980 to 2000.

In first period , there three diseases, they are malaria, tuberculosis and smallpox. In the 1950 the malaria is the most spread illness with its approximately just above 14000 cases. And the less one is tuberculosis with its 8000 cases. Both of them and including smallpox got decreasing till 1970. Becoming to the second period, there are three diseases as well, but instead of the illness smallpox here is aids. The aids sharply started to increase from its 6000 cases to just close to 1000 between 1980 and 2000 during childhood in a developing country. After 1970 the smallpox stoped to spread totally.