The two pie charts illustrate the distribution of energy sources in the United States across two distinct years, 1980 and 1990. Overall, it is clear that oil was the most significant contributor to energy production in both years, although its reliance decreased over the decade. Conversely, coal and nuclear power experienced growth in their proportional usage.
In 1980, oil accounted for 42% of the total energy supply, followed by natural gas at 26% and coal at 22%. Hydroelectric and nuclear power provided the smallest contributions, each representing 5% of the total. By 1990, the share of oil dropped by 9 percentage points to 33%, while natural gas also saw a slight decline to 25%.
In contrast, coal became a more prominent energy source, rising from 22% in 1980 to 27% in 1990. Similarly, the contribution of nuclear power doubled over the ten-year period, reaching 10% by 1990. Hydroelectric power remained the most stable source, maintaining a constant share of 5% throughout the decade. In summary, the energy landscape in the USA shifted towards a greater reliance on coal and nuclear power, while the dominance of fossil fuels like oil and gas diminished.