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

The graph demonstrates information about the proportion of river quality in the UK from 1990 and 2002.

Overall

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, it can be seen that

Wales

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and Northern Ireland (

NI

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) were always the best in the condition of rivers.

Additionally

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, the remaining countries had more noticeable changes in percentage. Looking at the figures of

NI

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and

Wales

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for

further

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details, it can be seen that

Wales

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had the biggest starting point in 1998 at 95% compared to 85% of

NI

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. 8 years later, the proportion of river quality in the two countries remained stable after

NI

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saw an increase to 95% until 2002,

in contrast

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, that for

Wales

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witnessed a decrease to 80%. Around 2000, the percentage of NII exceeded which for

Wales

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at 90%. Turning to the remaining statistics, where the changes were more considerable. From 1990 to 1994, the rate of chemical quality in water in England increased slightly between 45% to 55%,

this

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was followed by a noticeable fluctuation to under 50% in 2002. In nearly, 1998 and 2002, it took over the numbers of Scotland in 40% and 45% respectively. In regard to Scotland, its proportion went up slowly from approximately 20% to 30% between 1990 and 1994,

then

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it rose dramatically to 55% in 2000 but witnessed a considerable decline to 40% in 2002.