
Hi, There was this instruction associated with the graphs below: The two graphs show the main sources of energy in the USA in the 1980s and the 1990s. But I feel this instruction is not accurate, I am seeking a more precise description of the graphs: 1) First of all, what the graphs actually show us is the percentages or proportions for the main sources of energy. 2) Secondly, the graphs are only about the years 1980 and 1990, not 1980s or 1990s; the latters mean decades starting with 1980 or 1990.
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