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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 line graph compares the proportion of well-qualified chemical water in the UK rivers from 1990 to 2002.
It is noticeable that rivers in Wales and Northern Ireland had constant percentages before showing contrast patterns in 1998. Additionally, the other two countries considerably fluctuated throughout the period.
Starting at 45% in 1990, the proportion of England gradually increased until reaching a peak of approximately 70% in 1996. This figure then suddenly plummeted to 30% in 1998 before seeing a recovery at the end of the period. The chemical quality of rivers in Scotland witnessed a similar trend at the first half of the period, whose percentage accounted for 30% in 1996, then continued to rise by nearly 30%, ending with 40%.
While there were significant fluctuations between the two mentioned countries, both Wales and Northern Ireland experienced relatively stable tendencies. In the first three quarters of the period, the percentages of both countries remained unchanged, which were at 95% and 86% respectively. By 1998, while the former had dropped sharply, the latter increased to 95% and continued to be stable.
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