The pie chart demonstrates the main energy sources in the USA in 1980 and 1990.
Overview: In 1980, oil was the most used energy source, followed by natural gas, and the same pattern was observed in 1990. Interestingly, the demand for hydroelectric power remained unchanged in both years.
In more detail, the largest share of energy consumption in 1980 came from oil, accounting for 42%, followed by natural gas at 26%. Coal contributed 22%, while nuclear power and hydroelectric power had the lowest shares, both at 5%.
Moving on to 1990, oil remained the dominant energy source, though its share decreased to 33%, followed by coal at 27%. Natural gas ranked third, making up 25% of total energy consumption. The proportion of hydroelectric power remained unchanged at 5%, while the share of nuclear power doubled compared to 1980, reaching 10%.