The pie charts illustrate the five major energy sources in the USA in 1980 and 1990, including oil, natural gas, coal, hydroelectric power and nuclear power.
Overall, it is noticeable that the proportion of oil energy plunged drastically over the period of ten years. By contrast, the rest slightly increased or remained steady.
The percentage of nuclear power energy uplifted twice its former proportion (5%), at 10% in 1990. Similarlly, the figure for coal energy was 5% higher in 1990, at 27%. The opposite trend can be seen in the dramatic collapse of oil energy. This figure accounted for almost half the total of energy used in USA in 1980 (42%), nevertheless, it plummeted significantly by 33% after ten years.
Meanwhile, the proportion of hydroelectric power energy remained static at 5% of total rates. Additionally, in term of natural gas, the period also witnessed a marginal decrease in the consumption of the nation, falling from 26% to 25%, a difference of 1%.