The graph below gives information about the number of cases of diarrhea in Mashhad between 1983 and 1992.

The graph illustrates how many

cases

of diarrhoea in Mashhad over a period of 9 years from 1983 to 1992. In the first year, they stood at 100

cases

and remained stable until 1985. The following year, the figure doubled and reach 200

cases

. After that,

a

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the

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number

of

cases

minimally rose before they saw a noticeable decrease over the next 5 years back to the same level as 1983.

However

,

this

downward trend was suddenly broken and the

number

of

cases

boomed and reached a peak. They were quadrupled, which means that they were 400

cases

in 1989. Until end of the 1991, the figure did not have a remarkable change, but they had slight a fall between 1989 and 1990.

Finally

, the

number

of

cases

experienced a huge plunge to hit a dip level in the figure.

Overall

, the

number

of

cases

of diarrhoea in Mashhad had an upward and downward trend throughout the period.

Besides

they were at their highest

cases

number

in 1989,

although

they had zero

cases

of diarrhoea in Masshad in 1992.