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The image shows two pie charts detailing energy sources in the USA for 1980 and 1990. In 1980: Oil 42%, Natural Gas (NG) 26%, Coal 22%, Nuclear Power (NP) 6%, Hydroelectric Power (HP) 4%. In 1990: Oil 33%, Natural Gas 25%, Coal 27%, Nuclear Power 10%, Hydroelectric Power 5%.
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The two graphs demonstrate the main sources of energy in the USA between the years 1980 and 1990, presented percentage-wise.
At first glance, it is clear that oil has the largest proportion, while hydroelectric power has the smallest.
Turning to the details, the largest use in 1980 was oil at 42%, followed by natural gas at 26% and coal at 22%, while oil dropped to 33%, but still leads. Natural gas was 26% in 1980 and fractionally 25 % in 1990. Coal was 22% in 1980, but went up to 27% in 1990.
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