The two pie charts give some information about the Americans' consumption of the different five sources of energy in the years 1980 and 1990.

Overall, the usage of oil and natural gas decreased, whereas the proportion of consuming coal and nuclear power had the growth. Besides, the consumption of hydroelectric power remained stable.

At the first of the period, the percentage of using oil was 42% which was higher than other sources of energy; however, the usage of hydroelectric and nuclear power made up the lowest segment was 5%. Meanwhile, the consumption of natural gas and coal was 26% and 22% respectively.

At the end of the period, there was a slight decrease in using oil and natural gas, 33% and 25% respectively. On the other hand, the sector of consuming coal increased to 27% and nuclear power grew gradually to 10%. The usage of hydroelectric power stayed constant, was 5%.


Where are the charts?

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What was the prompt (and graph legend) for that task?