The line graph given illustrates changes in the quantity of cases relating to diarrhea in Mashhad from 1983 to 1992.
Overall, the cases in Mashhad went down moderately during a ten-year period. In addition there are not many remarkable increases in the first half years compared to the othersm
It is observed that the number of cases stood at 100 at first and relatively remained static until 1985. Following this the next two years came with a doubling in cases unexpectedly when they were about 200 in particular. However, this initial upward trend was abruptly broken, leading to a decline to the same level as they were in 1983.
1988 total showed a substantial rise as figures rapidly rocketed to about 400 cases up to the year 1989. This boom was not to last, though, as they dropped slightly nearly one hundred cases during two years later. In the last twelve-month period when the figures plateaued at a little more than 350, the most dramatic plummet could be seen there.
To sum up, the number of cases fluctuated gradually. They were at their highest in 1989 whereas the weakest figures ended up with zero cases in 1992.