The two graphs show the main energy sources in the USA in the 1980s and the 1990s.

The two graphs
illustrates
Correct subject-verb agreement
illustrate
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the various energy resources used in the USA in the two time periods ( 1980s and 1990s).
Overall
Linking Words
, it is evident that consumption of oil reduced in the
Correct your spelling
1990s
1990
Punctuation problem
1990,
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whereas
Linking Words
that of nuclear
power
Use synonyms
, natural gas, and coal increased. The resource whose
utilization
Change the spelling
utilisation
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for energy production remained constant was the hydroelectric
power
Use synonyms
. Oil was used in
higher
Correct article usage
a higher
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percentage compared to other resources in both years
,
Punctuation problem
;
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Linking Words
however
Add a comma
however,
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it
Correct pronoun usage
its
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consumption declined by 9 % in 1990.
In contrast
Linking Words
to that, 5% more coal and nuclear
power
Use synonyms
were used in the year 1990 compared to the year 1980. A similar uptrend was observed for natural gas, but only with a slight difference of 1% in the later year. Meanwhile, the only component whose
utilization
Change the spelling
utilisation
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remained the same for both
the
Correct article usage
apply
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years was hydroelectric
power
Use synonyms
standing
Punctuation problem
, standing
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at 5 % ( 1980 and 1990).

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Common mistake: Your writing should be 150-250 words.
Vocabulary: Replace the words power with synonyms.
Vocabulary: Rephrase the word "undefined" in your introduction.
Vocabulary: The word "compared" was used 2 times.
Vocabulary: The word "remained" was used 2 times.
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