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The image displays a line graph titled "River Water Quality in the UK" tracking data from 1990 to 2002 for Wales, Northern Ireland, England, and Scotland. The y-axis ranges from 0 to 100%, marked at intervals of 10, and represents "Good chemical quality %". Data for each region shows: Wales starting near 95% in 1990, peaking just below 100% around 1994, dipping slightly in 1996, and stabilizing near 95% in 2002. Northern Ireland begins around 60% in 1990, shows a sharp improvement to nearly 90% by 1994, sees a sharp drop back to 60% in 1996, recovers to around 90% by 1998 and 2000, dropping sharply again by 2002. England starts just above 70% in 1990, dips slightly below during the mid-90s, and climbs back to just above 70% by 2002. Scotland begins just under 90% in 1990, experiences a gradual decrease to about 80% by 2002. The graph uses distinct line styles for each region, plotted on a horizontally-oriented rectangular plot area with a grid.
Given the complexity of the image, the above description may not be entirely accurate.
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The chart illustrates the proportion of water in UK rivers that met the standards for good chemical quality from 1990 to 2002.
Overall, Wales accounted for the highest figures, while Scotland had the lowest percentages. England showed fluctuations, whereas Northern Ireland experienced a slight increase at the end of the period.
In 1992, Scotland showed an increase, reaching 30% of water, whereas England demonstrated a slight increase, reaching 50%. In contrast, Northern Ireland and Wales remained stable. From 1992 to 1996, Scotland remained stable at 30%, while England continued to rise, reaching 70%. Between 1996 and 1998, England faced a dramatic decline from 70% to 30%, meanwhile, Scotland continued to rise from 30% to above 40%. In addition, in 2000, Scotland reached a peak of 60%. From 2000 to 2002, England continued to rise after a decline, reaching under 50%, whereas Scotland faced a sharp decline from 60% to 40%.
In contrast, from 1990 to 1996, both Wales and Northern Ireland remained stable. From 1998 to 2000 Northern Ireland showed an increase rising from above 80% to over 90%, during that period Wales decreased from under 100% to 90%.
From 2000 to 2002, Wales continued to decline from 90% to 80%, however, Northern Ireland remained stable.
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