The diagram illustrates the production levels of the 
Uk’s
 main fuels including coal, natural Correct your spelling
UK’s
gas
 and Use synonyms
petroleum
 from 1981 to 2000.
   Use synonyms
Overall
, all the fuels mentioned had a fluctuation trend in the time frame. Linking Words
While
 the figure Linking Words
of
 both natural Change preposition
for
gas
 and Use synonyms
petroleum
 had an upward trend, coal’s Use synonyms
number
 decreased significantly until the end.
   In 1981, around 90 Use synonyms
million
 Use synonyms
tonnes
 of Use synonyms
petroleum
 was produced and increased significantly to 140 Use synonyms
million
 Use synonyms
tonnes
 in 5 years before plummeting by 40 Use synonyms
million
 Use synonyms
tonnes
 in the year 1991. Use synonyms
Beside
, the Replace the word
Besides
quantity
 of coal Change the quantifier
number
tonnes
 which was produced in the first year was 80 Use synonyms
million
, Use synonyms
this
 Linking Words
number
 fell to nearly 62 Use synonyms
million
 in 1986 and continued to decline slightly until 1991. Meanwhile, the Use synonyms
number
 of natural Use synonyms
gas
 has steadily increased from 42 to 43 Use synonyms
million
 Use synonyms
tonnes
 over 5 years.
   From the year 1991 to the end, the Use synonyms
number
 of Use synonyms
petroleum
 and natural Use synonyms
gas
 had a similar trend when both increased nearly by 40 Use synonyms
million
 Use synonyms
tonnes
 and reached 140 and 100 Use synonyms
million
 Use synonyms
tonnes
 respectively. Use synonyms
In contrast
, around 20 Linking Words
million
 Use synonyms
tonnes
 fluctuated decrease which was the production levels of coal. Use synonyms
This
 figure Linking Words
finally
 Linking Words
got
 30 Verb problem
reached
million
 Use synonyms
tonnes
 Use synonyms
at the end
 of the period.Linking Words