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

, it was important that fossil fuels in

both

times were the main sources of electricity in America.

According to

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

both

decades, formed 42% in the 1980s;

then

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

times. at the start, Coal constituted 22%;

thereafter

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

both

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

however

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