The pie charts illustrate units of electricity production by 5 particular sources in two countries during a two-decade period between 1980 and 2000.

The pie charts illustrate

units

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of electricity production by 5 particular sources in two countries during a two-decade period between 1980 and 2000.

Overall

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, what can be seen is that coal saw the highest result in Australia,

while

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oil was the most unpopular resource. What stands out from the second graph is that there were dramatic changes in all categories. Looking at the first pie chart, coal was the most popular type, which accounted for half of the chart. In the next year, it saw almost a triple increase from 50 to 130. Hydropower and natural gas were equal in the first year (20%).

However

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, in the next year, the former nearly doubled,

while

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the latter plummeted to 2%. What is more, oil

also

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decreased sharply, from 10% to 2%. The quantity of total production increased by 70

units

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. Regarding the second graph, total production has doubled, from 90 to 180

units

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. Coal and natural gas were at the same point (25%).

Nevertheless

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, coal has remained unchanged,

whereas

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the latter plunged to only 2%, making it at least a popular resource.

Moreover

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, nuclear power was three times as high as hydropower in 1980. But, in 2000, nuclear power increased dramatically by eight times,

while

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the latter decreased to 2%. A final change is that oil grew slightly, from 20 to 25

units

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.