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

The graph illustrates how many

cases

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

cases

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

cases

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. After that,

a

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the

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number

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of

cases

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

However

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,

this

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downward trend was suddenly broken and the

number

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of

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

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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

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, the

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of

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

Overall

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, the

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of

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

Besides

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they were at their highest

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number

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in 1989,

although

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they had zero

cases

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of diarrhoea in Masshad in 1992.