The chart illustrates the percentage distribution of energy sources – coal, natural gas, nuclear power, and renewable energy – in a country between 1990 and 2020.
Overall, coal remained the dominant source of energy throughout the period, although its share declined slightly after 2010. Meanwhile, renewable energy showed the most remarkable growth, particularly during the final decade, while nuclear power and gas saw modest declines.
In 1990, coal accounted for about 40% of total energy consumption, rising to 45% in 2010 before dropping slightly to just below 40% by 2020. Natural gas represented roughly one-third of the total in 1990, but its proportion fell to around 25% in 2010 and to just under 20% in 2020.
By contrast, renewable energy more than doubled from 10% to 20% over the same period, marking the most significant increase among all categories. Nuclear power remained relatively stable, experiencing only a minor decline from 18% to 16% by the end of the period.