The given bar chart illustrates information about the percentage of renewable energy supplied in Australia, Sweden, Iceland, and Turkey between 1997 and 2010.
Overall, it is evident that there were upward trends in the figures for renewable energy provided in Sweden and Iceland throughout the observed period, whereas the reverse was true in the case of Australia and Turkey.
In 1997, Iceland produced by far the highest proportion of renewable energy, standing at around 45%, which then went up significantly to 60% in 2000 and peaked at 70% in the year 2010. The second rank was Turkey, which accounted for under 40% of the amount of energy supplied in 1997 and saw a fluctuation before dropping to 32% in the final period.
Regarding Australia, roughly 9% of the total energy was generated from renewable resources in 1997, and by 2010, this figure had fallen by 5%. In contrast, Sweden experienced the lowest rate among four countries in 1997, at approximately 5%, which climbed steadily to 8% over the last 13 years.