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 diagrams provided detail

the

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with the

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primary

sources

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of

energy

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in the USA over the course of a decade. Notably, the oil sector experienced the largest shifts,

while

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alterations in other sectors were minor in comparison. In 1980, as depicted by the pie chart, oil held the predominant share at 42 per

cent

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, nearly accounting for half of the total. Other

energy

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sources

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such

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as natural gas and coal were somewhat less prevalent, representing 26 and 22 percent respectively. The least popular types of

energy

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sources

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were nuclear and hydroelectric power, each constituting less than 10 per

cent

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. By the 1990s, the landscape had slightly evolved. Despite a decrease of 8 per

cent

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, oil remained the primary

energy

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source. The popularity of natural gas and coal remained fairly stable, changing by only 1 per

cent

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in comparison to the previous decade. Nuclear and hydroelectric power

sources

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continued to be less favoured, with shares of 10 and 5 per

cent

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respectively.