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

The line graph illustrates the proportion of good

river

water

quality

in four distinct countries

Wales

, Nothern Ireland, England and Scotland from 1990 to 2002.

Overall

, there was an increase in the percentage of

quality

of

river

water in three countries

while

it witnessed a slight decline in

Wales

.

Additionally

,

Wales

had the highest figures but

then

in 1999, it was overtaken by the rate of Northern Ireland's

river

. Looking at the figure for Northern Ireland, the percentage of rivers

have

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that have

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good chemical

quality

in N.I

was

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started at 85%, it remained the same until the year

of

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1998 and

then

it experienced a gradual increase to about 97% in 2002. The proportion of water

quality

in

Wales

country was 95% but it still remained in place until 1998 and

then

there was declined slightly to 80% in the

last

year of the period. Moving to England, the rate was 55%,after which it observed a considerable growth to 66% and a final drop to more than 57% in 2002. The Scotland

river

rate began at 55%, followed by a

dramatical

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increase to 55%, but

then

it

finally

dropped to 40% in the

last

year of the period.