The two graphs show the main sources of energy in the USA in the 1980s and the 1990s, write a report to describe the changes occurred.

Main sources of energy in the USA in the 1980s and the 1990s
The two pie charts show the amount of energy produced by different sources in USA in 1980 and 1990. Overall, it is clear that oil remained the major source of energy through the 10-year period while the percentage of hydroelectric power stayed the lowest.

In 1980, the oil segment counted for 42% of total power consumption but lost 9% share during the following decade dropping dramatically to 33% by 1990. Meanwhile, natural gas and hydroelectric power were stable through 1980 to 1990. Likewise, the percentage of energy gained from natural gas decreased by 1% in 10 years and one quarter of total energy came from this source in 1990.

In contrast, as can be seen in the same period, percentage of nuclear power jumped from a mere 5% to 10%, which doubled its proportion of overall energy consumption. Turning to another important trend, the coal segment grew by 5% during the decade. This was 6% lower than the proportion of oil and 2% higher than that of natural gas, making it the second largest group of energy source.

Votes
Average: 7.8 (1 vote)

Transition Words or Phrases used:
but, if, likewise, second, so, while, in contrast

Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments

Performance on Part of Speech:
To be verbs : 4.0 7.0 57% => More to be verbs wanted.
Auxiliary verbs: 1.0 1.00243902439 100% => OK
Conjunction : 6.0 6.8 88% => OK
Relative clauses : 3.0 3.15609756098 95% => OK
Pronoun: 7.0 5.60731707317 125% => Less pronouns wanted
Preposition: 36.0 33.7804878049 107% => OK
Nominalization: 6.0 3.97073170732 151% => OK

Performance on vocabulary words:
No of characters: 908.0 965.302439024 94% => OK
No of words: 191.0 196.424390244 97% => OK
Chars per words: 4.75392670157 4.92477711251 97% => OK
Fourth root words length: 3.71756304063 3.73543355544 100% => OK
Word Length SD: 2.5073450938 2.65546596893 94% => OK
Unique words: 110.0 106.607317073 103% => OK
Unique words percentage: 0.575916230366 0.547539520022 105% => OK
syllable_count: 261.0 283.868780488 92% => OK
avg_syllables_per_word: 1.4 1.45097560976 96% => OK

A sentence (or a clause, phrase) starts by:
Pronoun: 2.0 1.53170731707 131% => OK
Article: 4.0 4.33902439024 92% => OK
Subordination: 1.0 1.07073170732 93% => OK
Conjunction: 0.0 0.482926829268 0% => OK
Preposition: 2.0 3.36585365854 59% => More preposition wanted as sentence beginning.

Performance on sentences:
How many sentences: 8.0 8.94146341463 89% => OK
Sentence length: 23.0 22.4926829268 102% => OK
Sentence length SD: 32.1442063209 43.030603864 75% => OK
Chars per sentence: 113.5 112.824112599 101% => OK
Words per sentence: 23.875 22.9334400587 104% => OK
Discourse Markers: 6.125 5.23603664747 117% => OK
Paragraphs: 4.0 3.83414634146 104% => OK
Language errors: 0.0 1.69756097561 0% => OK
Sentences with positive sentiment : 7.0 3.70975609756 189% => OK
Sentences with negative sentiment : 1.0 1.13902439024 88% => OK
Sentences with neutral sentiment: 0.0 4.09268292683 0% => More facts, knowledge or examples wanted.
What are sentences with positive/Negative/neutral sentiment?

Coherence and Cohesion:
Essay topic to essay body coherence: 0.188527342026 0.215688989381 87% => OK
Sentence topic coherence: 0.0839781965297 0.103423049105 81% => OK
Sentence topic coherence SD: 0.140048684164 0.0843802449381 166% => OK
Paragraph topic coherence: 0.203775215607 0.15604864568 131% => OK
Paragraph topic coherence SD: 0.195509582165 0.0819641961636 239% => More connections among paragraphs wanted.

Essay readability:
automated_readability_index: 12.9 13.2329268293 97% => OK
flesch_reading_ease: 65.05 61.2550243902 106% => OK
smog_index: 3.1 6.51609756098 48% => Smog_index is low.
flesch_kincaid_grade: 9.9 10.3012195122 96% => OK
coleman_liau_index: 10.57 11.4140731707 93% => OK
dale_chall_readability_score: 7.67 8.06136585366 95% => OK
difficult_words: 35.0 40.7170731707 86% => OK
linsear_write_formula: 10.5 11.4329268293 92% => OK
gunning_fog: 11.2 10.9970731707 102% => OK
text_standard: 11.0 11.0658536585 99% => OK
What are above readability scores?

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Rates: 78.6516853933 out of 100
Scores by essay e-grader: 7.0 Out of 9
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Note: the e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.