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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 illustrates the percentage of good chemical quality of rivers in UK between 1990 and 2002.
Overall, in this picture an increase observed, except Wales. At the beginning of the year the biggest was Wales, and lowest was Scotland, and at the end of the year Northern Ireland increased to first place, but Scotland remained the last.
In 1990, the highest percentage was in Wales, at 95%, it remained at the same percentage until 1998 and significantly declined to 80%. Northern Ireland also similar with Wales, however it began with 85%, and there is no change until 1998 and increased to 95%.
In England it observed considerably increase. There was an increase sharply from around 48% to 70% until 1996, the figure dramatically declined to about 30% between 1996 and 1998. Then this rating rose again to 50%. Regarding Scotland, it recorded the last percent with just over 20%. It increased significantly to 60 percent until 2000 but decreased to 40 percent at the end of the year.
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