The two pie charts compare the proportions of five different sources of energy used in the United States of America between 1980 and 1990.
Overall, although the usage of oil declined, it still remained the leading position source of energy, while hydroelectric power accounted for the smallest share with remaining steady over the period.
At the beginning of the period, oil made up 42% of energy consumption, which was around 37% higher than both hydroelectric power and nuclear power. However, its figure declined significantly to 33% by 1990. Despite this drop, it continued to be the most used source of energy. Meanwhile, hydroelectric power and nuclear power both started at 5%, the former remained stable over time, maintaining the least used, while latter doubled to 10%.
Similarly, natural gas and coal were also widely used in 1980, accounting for 26% and 22%, respectively. Natural gas saw a slight decrease to 25%, whereas coal experienced a gradual growth and became the second most used energy source by 1990.