The graph below shows the percentage of river water in the UK that is of good chemical quality, in the period between 1990 and 2002.

The line diagram illustrates the percentage amount of good chemical quality in four regions of the United Kingdom

rivers

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from 1990 to 2002. From an

overall

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perspective,

it is clear that

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Wales was the best

water

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substance in 1990,

then

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had a negative trend,

while

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Scotland and Northern Ireland became the highest quality

rivers

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in 2002.

To begin

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with, England contained the poorest

water

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composition in 1990,

then

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it fluctuated until reached its peak in the next decade, which accounted for 90% and remained stable for two

years

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later.

On the other hand

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, Wales which was previously graded as the most qualified for its river chemical, fell down continuously from 1998 until four

years

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later with approximately 93%. For Scotland, it was constant in six

years

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with 94,5%, which was slightly declined in 1998 and the lowest point of its performance.

Furthermore

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, it grew positively in two

years

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at almost 98%,

then

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constantly became one of the best

rivers

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' compositions.

On the other hand

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,

rivers

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in Northern Ireland struggled with the better-qualified

water

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, with their fluctuations in six

years

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since 1990, reaching the bottom at 82%.

However

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, it rose significantly until became the highest level of chemical

water

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in 2002, the same as Scotland.