The graph below illustrates the amount of reposted diarrhea sympthoms in Mashad from 1983 to 1992. This graph presents dramatic falls and rises.
Overall, the number of cases fluctuated throughout the period, with a significant peak in 1989 followed by a dramatic fall by the end of the decade. Despite some variations, the trend shows both gradual and sharp changes at different stages.
In the early years, from 1983 to 1985, the number of cases remained relatively stable at around 100. This figure then began to rise, reaching approximately 180 in 1986 and peaking slightly higher at 200 in 1987. However, this upward trend was interrupted in 1988 when the number of cases dropped sharply back to around 100. The most notable change occurred in 1989, when cases surged dramatically to about 400 – the highest point on the graph. After this peak, the number declined to around 350 in 1990 and remained relatively stable in 1991 at a similar level. By 1992, the trend reversed dramatically, with the number of cases falling to zero, marking the lowest point of the entire period.