The provided charts depict the main energy sources utilized in the USA during the 1980s and 1990s.
Overall, in both 1980 and 1990, oil was the primary energy source, with slight fluctuations in its percentage. Coal experienced a notable increase, surpassing natural gas to become the second most prevalent energy source in 1990. Hydroelectric power remained consistent at 5%, while nuclear power saw a remarkable increase from 5% to 10% over the decade.
In 1980, oil accounted for the largest share of energy consumption at 42%, which then decreased to 33% by 1990, though it remained the predominant energy source. Natural gas was the second most utilized energy source in 1980 at 26%, dropping slightly to 25% in 1990. Conversely, coal, which held the third position in 1980 with 22%, experienced a significant rise to 27% in 1990, surpassing natural gas to become the second most prominent energy source.
In terms of nuclear power and hydroelectric power, both sources had equal shares of 5% in 1980. However, by 1990, there was a significant increase in nuclear power consumption, jumping to 10%. On the other hand, hydroelectric power retained its 5% share, showing no change over the decade.