The two graphs show the main sources of energy in the USA in the 1980s and the 1990s.Write a report for a university lecturer describing the changes which occurred.

The two pie charts illustrate the main energy sources used in the United States over the duration of a decade, from 1980 to 1990.

Overall, oil is the main source of energy in the USA both at the beginning and at the end of the given time period. Conversely, hydroelectric power contributes the least percentage. Other forms of energy also see little, if any, change during the ten-year course.

In 1980, oil constitutes the largest percentage of total energy sources, at 42%. However, this figure drops to 33% by 1990. Similarly, natural gas comprises 26% of the total figures in 1980 but falls slightly to a quarter ten years later.

On the other hand, coal and nuclear power account for 22 and 5% of the main energy sources in 1980, respectively, before both figures see a 5% increase by the end of the decade. Hydroelectric power, however, experiences no change over time, remaining constant at 5%.

Votes
Average: 7.3 (1 vote)

Transition Words or Phrases used:
also, but, conversely, however, if, similarly, so, on the other hand

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

Performance on Part of Speech:
To be verbs : 1.0 7.48453608247 13% => More to be verbs wanted.
Auxiliary verbs: 0.0 4.92783505155 0% => OK
Conjunction : 4.0 5.05154639175 79% => OK
Relative clauses : 0.0 3.03092783505 0% => OK
Pronoun: 1.0 32.9175257732 3% => OK
Preposition: 28.0 26.3917525773 106% => OK
Nominalization: 1.0 3.85567010309 26% => More nominalizations (nouns with a suffix like: tion ment ence ance) wanted.

Performance on vocabulary words:
No of characters: 760.0 937.175257732 81% => OK
No of words: 156.0 206.0 76% => More content wanted.
Chars per words: 4.87179487179 4.54256449028 107% => OK
Fourth root words length: 3.53411884305 3.78020617076 93% => OK
Word Length SD: 2.66709809133 2.54303337028 105% => OK
Unique words: 96.0 127.690721649 75% => More unique words wanted.
Unique words percentage: 0.615384615385 0.622605031667 99% => OK
syllable_count: 228.6 290.88556701 79% => OK
avg_syllables_per_word: 1.5 1.41237113402 106% => OK

A sentence (or a clause, phrase) starts by:
Pronoun: 1.0 9.13402061856 11% => OK
Article: 1.0 0.824742268041 121% => OK
Subordination: 2.0 1.83505154639 109% => OK
Conjunction: 0.0 0.463917525773 0% => OK
Preposition: 5.0 1.44329896907 346% => Less preposition wanted as sentence beginnings.

Performance on sentences:
How many sentences: 9.0 12.6804123711 71% => Need more sentences. Double check the format of sentences, make sure there is a space between two sentences, or have enough periods. And also check the lengths of sentences, maybe they are too long.
Sentence length: 17.0 16.3608247423 104% => OK
Sentence length SD: 37.5292478534 44.8134815571 84% => OK
Chars per sentence: 84.4444444444 76.5299724578 110% => OK
Words per sentence: 17.3333333333 16.8248392259 103% => OK
Discourse Markers: 7.55555555556 4.34317383033 174% => OK
Paragraphs: 4.0 4.29896907216 93% => OK
Language errors: 0.0 2.54639175258 0% => OK
Sentences with positive sentiment : 6.0 7.41237113402 81% => OK
Sentences with negative sentiment : 1.0 1.49484536082 67% => OK
Sentences with neutral sentiment: 2.0 3.94845360825 51% => OK
What are sentences with positive/Negative/neutral sentiment?

Coherence and Cohesion:
Essay topic to essay body coherence: 0.157302060595 0.216113520407 73% => OK
Sentence topic coherence: 0.0599818421378 0.0766984524023 78% => OK
Sentence topic coherence SD: 0.0544778307247 0.0603063233224 90% => OK
Paragraph topic coherence: 0.101940371738 0.12726935374 80% => OK
Paragraph topic coherence SD: 0.0477921435191 0.0580467560999 82% => OK

Essay readability:
automated_readability_index: 10.2 8.37731958763 122% => OK
flesch_reading_ease: 62.68 70.7449484536 89% => OK
smog_index: 3.1 3.82989690722 81% => OK
flesch_kincaid_grade: 8.7 7.45979381443 117% => OK
coleman_liau_index: 10.67 8.71597938144 122% => OK
dale_chall_readability_score: 8.33 7.59969072165 110% => OK
difficult_words: 38.0 41.2886597938 92% => OK
linsear_write_formula: 7.0 8.62886597938 81% => OK
gunning_fog: 8.8 8.54432989691 103% => OK
text_standard: 9.0 8.15463917526 110% => OK
What are above readability scores?

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Rates: 73.0337078652 out of 100
Scores by essay e-grader: 6.5 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.