The chart illustrates the percentage distribution of energy sources used in a country from 1990 to 2020. The data is categorized into four main sources: coal, natural gas, nuclear power, and renewable energy.
Overall, coal consistently remained the dominant energy source throughout the period, while renewable energy showed a gradual increase in its contribution. In contrast, the reliance on nuclear power and natural gas fluctuated significantly over the three decades.
In 1990, coal accounted for 40% of total energy usage, making it the largest contributor, followed by natural gas at 30%. Nuclear power contributed 20%, and renewable energy made up only 10%. By 2005, coal usage had slightly increased to 45%, while natural gas dropped to 25%. Nuclear power experienced a marginal decline to 18%, whereas renewable energy grew to 12%.
By 2020, the use of renewable energy doubled to 20%, reflecting the highest growth among all sources. Coal remained the largest contributor, but its percentage fell slightly to 42%. The usage of natural gas declined further to 22%, and nuclear power dropped minimally to 16%.