The line chart illustrates the number of diarrhea cases reported in Mashhad over a 9 year period from 1983 to 1992.
Overall, the total instances of diarrhea experienced significant volatility throughout the timeframe, reaching a peak in 1989 before precipitously dropping to zero by 1992.
Between 1983 and 1985, figures remained steady at 100 cases before rising moderately to a minor peak of 200 in 1987. This upward trend was briefly interrupted in 1988, when the count halved back down to 100 cases. However, the following year witnessed a dramatic surge, with reported infections quadrupling to hit an all time high of 400 cases in 1989.
Thereafter, the prevalence of the condition began to fall. Figures dipped slightly to approximately 340 cases in 1990 and remained stable through 1991. Subsequently, a sharp decline occured in the final year, resulting in no reported diarrhea cases in 1992.
