Band 9: The two graphs show the main sources of energy in the USA in the 1980s and the 1990s. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The two pie charts illustrate the primary sources of energy in the USA during the 1980s and the 1990s, categorized into oil, natural gas, coal, hydroelectric power, and nuclear power.

Oil remained the dominant energy source in both decades, though its share decreased in the 1990s. While coal and nuclear power experienced slight increases, hydroelectric power remained unchanged, and natural gas saw a marginal decline.

In the 1980s, oil accounted for the largest portion, contributing 42% of the total energy. This dropped to 33% in the 1990s, marking a noticeable decrease. Similarly, natural gas, which was the second-largest source at 26% in the 1980s, saw a slight dip to 25% in the following decade.

Coal usage increased moderately from 22% in the 1980s to 27% in the 1990s, overtaking natural gas as the second-largest energy source. Nuclear power also grew significantly, doubling its share from 5% to 10%. In contrast, hydroelectric power remained constant at 5% across both decades.