The pie charts illustrate the percentage of seven different part of water pollution between 1997 and 2007.
Overall, the figure for pollutant from air was more common in earlier years but domestic sewage significantly overtook by end of period. Additionally, offshore oil with a remarkebly increase over time but industrial waste saw a drastically fall.
In 1997, the percentage of pollutans from air started with 30% . Whereas by 2007, this figure decreased to 29%. Also, domestic sewage and offshore saw a significant rise with 11% and 9%.
The figure for litter, farm, industrial waste and marrine saw notable went down from 4%,4%,17%and 22% to 0%,2%,9% and 17% between 1997 and 2007.
