The chart shows the proportion of renewable energy in total energy supply in 4 countries from 1997 to 2010

The bar chart demonstrates the percentages of environmentally-friendly resources in the total sources of energy in four nations between 1997 to 2010.

As can be seen from the chart, the proportion of renewable sources in Iceland was the highest among the four countries, which experienced a stable increase over the given period.

In 1997, approximately 5% of energy in Sweden was renewable energy. Over the next 13 years, this proportion observed a steady rise to slightly under 10% in 2010. A similar trend was seen in the percentage of inexhaustible energy in Iceland, which rose dramatically from about 45% in 1997 to 70% in 2010.

Around 10% of the total energy in Australia was environmentally-friendly energy at the beginning of the period. This percentage then decreased significantly to 5% in 2010. Renewable energy in Turkey accounted for 38% in 1997. This reached the peak of slightly over 40% in 2000 before registering at around 30% in 2010.