The given bar chart illustrates the percentage of renewable energy in the total energy supply of fourcountries over the course of 13 years, starting from 1997.
Overall, the chart illustrates an upward trend in renewable energy sources in Iceland and Sweden, whereas Australia and Turkey witnessed a noticeable drop. Significantly, Iceland was the most prevalent, followed by Turkey.
At the starting point, Sweden and Iceland stood at 5% and 45%, respectively. After that, both countries witnessed an increase to 9% for the former and 70% for the latter in 2010 ranking first. This figure indicates that the trend in Sweden was much more modest than in Iceland.
The contrasting pattern can be seen in Australia. Standing at nearly 10%, the rate of renewable energy subsequently saw a decline to over 5% in 2000, ending the period with approximately 4%. There was a fluctuation in the proportion of renewable energy supply in Turkey, while this country saw a significant increase from about 38% to over 40% in the period of 1997-2000. This figure dropped by nearly 10%, standing at around 31% after ten years.