The illustrations present pie charts delineating the primary energy sources utilized in the United States during the years 1980 and 1990.
Overall, there was a discernible shift in energy consumption trends over the decade, particularly a reduction in oil dependency and an increment in nuclear power usage.
In 1980, oil constituted the predominant energy source, accounting for 42% of the total energy consumption. Natural gas followed, representing 26%, while coal accounted for 22%. Both hydroelectric power and nuclear power held equal shares at 5%. These proportions illustrate a clear reliance on fossil fuels during this period, with oil being the most significant contributor to energy needs.
By 1990, there was a noticeable decline in the proportion of oil as an energy source, which fell to 33%. However, natural gas saw a slight increase to 27%, while coal usage experienced a marginal rise to 25%. Notably, nuclear power experienced a significant increase, rising to 10%, whereas the share of hydroelectric power remained stable at 5%. This indicates a gradual diversification of energy sources, with a growing emphasis on nuclear energy.