the chart below shows the percentage of water in UK rivers that was classified as having good chemical quality between 1990 and 2002. Summurise the information by selecting and reporting the main features, and make comparisons where relevant.

The image depicts the percentage of good quality river water from 1990 to 2002 in Wales, Northern Ireland, England, Scotland. Wales: consistently 95% (1990-2002), Northern Ireland: 70% (1990-1994), 82% (1996), decline to 60% (1998), increase to 98% (2000), drop to 94% (2002), England: gradual increase from 30% (1990) to 55% (1998), slight fall to 51% […]