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Energy Consumption by Source in a Country

The pie charts below show the percentage of energy consumption by different sources in a particular country in 2000 and 2020. Summarise the information by selecting and reporting the main features, and make comparisons where relevant. *[图表文字描述：两个饼图。2000年：石油 40%，煤炭 25%，天然气 20%，核能 10%，可再生能源 5%。2020年：石油 30%，煤炭 15%，天然气 25%，核能 15%，可再生能源 15%。]*