The two graphs show the main sources of energy in the USA in the 1980s and the 1990s. Write a report for a university lecturer describing the changes which occurred

The given pie charts compare data about the portion of 5 various sources of energy like

,

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fossil fuels, Hydropower, and Nuclear plants that the USA used at 2 points in time namely, the 1980s and the 1990s.

Overall

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, it was important that fossil fuels in

both

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times were the main sources of electricity in America.

According to

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the diagrams, Oil, the most common factor from which the USA generated electricity in

both

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decades, formed 42% in the 1980s;

then

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in the 1990s, its fraction reported nearly one-third. The second one in the 1980s was Nutral gas, and it composed roughly the same portion at approximately a quarter in

both

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times. at the start, Coal constituted 22%;

thereafter

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, in 1990s, its percentage 5% increased. The graphs demonstrate that in the 1980s,

both

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Hydroelectric and Nuclear power made up the same proportion at 5% after that, Nuclear energy climbed to 10% in the 1990s;

however

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, in the 1990s, the fraction of another was absolutely equal to the prior time.