The given line chart depicts the number of production levels of main fuels in a European country between 1981 to 2000. 
Overall
, it can be clearly seen that the petroleum trend was the most, despite slightly Linking Words
fluctuated
 during the entire period, the Wrong verb form
fluctuating
amount
 of petroleum hit its peak around 1985 to 1987 and 1997. Natural gas was steady at the beginning before Use synonyms
overtook that
 the number of coal in 1997.
The Wrong verb form
overtaking
amount
 of petroleum rose gradually from 1981 to 1983, growing to a stable of some 130 Use synonyms
tonnes
 Use synonyms
which
 was the highest number. After that, the production levels Punctuation problem
, which
were 
declined and plateaued before rebounding to around 130 Verb problem
apply
tonnes
 and ending at 100 Use synonyms
tonnes
 in 2000.
The Use synonyms
amount
 of coal continuously remained at 80 Use synonyms
tonnes
 during 1981 to 1984 ,Use synonyms
which
 Correct word choice
 when
the
 significant Correct article usage
a
dropping
 Check wording
drop
happened
 to lower than 60 Verb problem
occurred
tonnes
 Use synonyms
and
 the trend gradually decreased to 40 Punctuation problem
, and
tonnes
 Use synonyms
in
 the Change preposition
by
ending
 of the period. Replace the word
end
Lastly
, the natural gas production levels were steady at 40 until 1994 ,Linking Words
which
 the trend Correct word choice
 when
was 
started rising and overtook Verb problem
apply
that 
the Correct word choice
apply
amount
 of coal Use synonyms
product
 in 1997 and Replace the word
produced
finishing
 at above 80 Wrong verb form
finished
tonnes
 by 2000.Use synonyms