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 pie chart demonstrates the key sources of energy utilized in the United States. In fact, the figures are given for the periods of the1980s and 1990s. As a whole, oil can be recognized as the main source that was used to generate energy for both time periods.

On the contrary

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, nuclear power was the least utilized medium as per the circle graph. Most importantly, oil contributed to the majority of the production at 42% in the 1980s,

whereas

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, a 9% decrease was denoted in the succeeding decade.

Moreover

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, natural gas accounted for approximately half of the power requirements of America for both durations. Coal was the most prominent source in the nineties after oil, at slightly higher than a quarter, whilst the preceding decade recorded an amount that was moderately higher than a fifth. In terms of hydroelectricity, the couple of decades exhibited the same numbers which were a minute minority of usage.

Furthermore

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, nuclear energy was employed to obtain power at 5% in the eighties,

while

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the amount doubled in the nineties.