The line graph delineates the information on the frequency with which people were infected with diarrhea from 1983 to 1992 in Mashhad.
Overall, diarrhea cases did not exceed more than 200 per year for most of the time, although there was a sudden boom of it for 3 years, the illness completely disappeared from the city by the end of the period.
From 1983 until 1983, the number of cases stood the same, leveling off at 100. This was followed by a slight increase in ‘85, resulting in approximately 110 cases. Right the year after(’86), the rate of people , being infected by diarrhea , became more frequent, resulting in well above 150. Before abruptly plummeting to its initial value, figures had experienced a significant rise in ‘87, doubling the results of 1983.
After falling to its initial value, figures showed a rapid climb, accounting for 400 cases in 1989, which is by far the most frequent number of cases registered. Following that, figures saw a moderate decrease in ’90, leveling off at the rate of 350 for the next year (’91). Ultimately, figures plunged to the zero number of cases by 1992.