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The image contains two pie charts representing the main sources of energy in the USA for 1980 and 1990. In 1980: oil 42%, natural gas 26%, coal 22%, hydroelectric power 5%, nuclear power 5%. In 1990: oil 33%, natural gas 25%, coal 27%, hydroelectric power 5%, nuclear power 10%.
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The 2 diagrams illustrate the leading funds of energy in the USA in the 1980 to 1990.
Overall,the most usefully funds is oil ,and the most least used is hydroelectric power in the USA.
Firstly it can be seen that the hydroelectric power is spending steadily throughout the period , however oil is decrease begin 42 % in 1980 to 33% in 1990,the figures nucreal power is increase dramatically from 1980 to 1990
However, it is also worth noting thatnatural gas is decrease from 26 in 1980 to 25 in 1990.Futhermore we can see that the coal is increase significantly in 1980 to 1990 from 22% to 27%
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