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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 proportion of water in rivers across four regions of the UK including Wales, Northern Ireland, England, and Scotland that met high chemical standards over the period from 1990 to 2002.
In 1990, Wales had the highest percentage of river water with good chemical quality, starting at around 95%, then remained unchanged until 1996. However, from 1998 to 2002, the figure for this in Wales decreased significantly from 95% to 80%. Conversely, the rate of river water achieving good chemical standards in Northern Ireland stayed stable at 85% until 1996, then increased slightly to 95% in 2000 and remained at that level until 2002. Similarly, the proportion of good quality river water in Scotland rose gradually from 20% to 30% over the period between 1990 and 1996, continuous increase dramatically and reached it peak at 50% in 2000, followed by a drop to 40% in 2002.
Meanwhile, England’s high-quality water percentage experienced considerable fluctuations throughout the period. It rose dramatically from 54% to 60% during the years 1990 to 1996. On the contrary, the figure dropped considerably to its lowest point at 30% in 1998. In the rest of the timescale, it recovered to nearly 50% in 2002, slightly higher than when it started in 1990.
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