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 graph demonstrates information on the value of good chemicals in the UK rivers,

while

this

line illustrates the ratio of the UK river water between 1990 and 2002 .

Overall

, it can be clearly seen that the value of good chemicals in Wales and North Island river water started almost the same from 1990 to 1998, but between 1998 and 2000, these figures experienced a slight increase or decrease.

Whereas

,

this

trend in Scotland significantly moved upward between 1990 and 2002 and became less popular by the end period. As regards the quantity of well chemicals in Wales and North Island rivers water started absolutely the same at 95% and 85% between 1990 and 1998 .

Moreover

, having started dominant statistics of Wales from 1990 to 1998;

however

,

this

research became the second list at 80% in the chart by 2002.

In addition

, statistics of North Island became dominant at 95 % by the end time span. Turning to statistics of England,

this

figure rapidly climbed from 45% to 70% between 1990 and 1996 , but that experienced a sharp decline from 70% and 30% in 1996 and 1998.

Conversely

, these figures rose gradually from 1998 to 2002.

Besides

, the data of Scotland upsurged slightly between 1990 and 1992, but it experienced a level out in the next 4 years;

however

,

this

trend doubled rose from 30% to 60% between 1996 and 2000 but fell considerably from 60% to 40% by the 2002 year.