the chart below shows the percentage of river water in UK rivers that is classified as aving good chemical quality between 1990 and 2002

The given line graph illustrates the

proportion

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of water in rivers of four distinctive rivers located in the United Kingdom

according to

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the

quality

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of

chemicals

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from 1990 to 2000. Generally speaking, it can be clearly seen that the

proportion

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of chemical

quality

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in

river

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water in

Wales

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was the highest

figure

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in the beginning.

Followed

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, the percentage of chemical

quality

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in Scotland's

river

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was the lowest

point

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.

However

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, the

figure

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for the

quality

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of

chemicals

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in Scotland's

river

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finished at the highest percentage.

To begin

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, the

proportion

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of chemical

quality

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in

river

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water at both

Wales

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's

river

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and Northern Ireland's

river

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was unchanged by 95% and 85% respectively over an 8-year span. After that, the

figure

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for chemical

quality

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in Northern Ireland's

river

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increased to overtake the

point

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of the

quality

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of

chemicals

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in

Wales

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's

river

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to 85% after the following year, before remaining constant

at the end

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of time,

while

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the

figure

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for the chemical's

quality

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from

Wales

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's

river

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fell considerably to 80% from 1997 to 2002. Moving on to the percentage of

chemical's

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chemical

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quality

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in England's

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river

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rivers

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, the

figure

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increased to reach a peak at approximately 70% from 1990 to 1996. the

proportion

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of

quality

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of

chemicals

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in England's

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river

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rivers

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then

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decreased sharply to 30%

in

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apply

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two

year

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years

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later, before going up to the same

point

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at the time's start in 2002. Especially, the

proportion

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of the

quality

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of

chemical

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chemicals

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in Scotland's

river

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increased and

over take

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overtake

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the

point

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of England's

river

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from 30% to nearly 60% in 2000, after remaining

the

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at the

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same

point

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at 30% from 1992 to 1996. And

then

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,

this

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figure

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decreased to 40% in 2002.