The line chart provides information about the proportion of river water quality in four different UK countries from 1990 to 2002.
Overall, it is clear that there was an increase in the quality of water in both Northern Ireland and Scotland, while the opposite was true for Wales, and the data for England fluctuated over time. Additionally, Wales’ rivers had the highest quality for most of the period.
In 2010, around 95% of fresh river water in Wales and this number remained stable until the next eight years. In this same timeframe, the data on high-quality water in Northern Ireland had a similar trend, beginning with roughly 88%. Subsequently, the percentage of high-quality river water in Wales dropped by approximately 10%. In comparison, the percentage of that in Northern Ireland experienced a rise to 95% in 2002, surpassing the rate of Wales to become the highest number.
The proportion of river water quality in England started at roughly 45%, after which saw growth to 70% in 1996. And then, the rate of that declined to the lowest point at 30% in the next year and recovered to approximately 48% in 2002. Meanwhile, around 20% of high-quality water in 1990 in Scotland, with a subsequent considerable rise to nearly 60% in 2000, followed by a final drop to 40% in 2002.