The graph illustrates key information about the significant kinds of 
energy
 fuel in the UK and its level of production between 1981 and 2000. The Use synonyms
units
 are measured Use synonyms
i
 Correct your spelling
in
energy
 Use synonyms
units
. 
Use synonyms
Overall
, it is clear from the graph that petroleum has a significant Linking Words
increase
 during the given Use synonyms
period
. In 1981 it was about 90 Use synonyms
energy
 Use synonyms
units
, and there was a dramatic Use synonyms
increase
 in 1986 it was about 140 Use synonyms
energy
 Use synonyms
units
Use synonyms
,
 and Remove the comma
apply
then
 dropped slightly to become 100 Linking Words
energy
 Use synonyms
units
 in 1991. In 2000, the petroleum rose up again to reach 140 Use synonyms
energy
 Use synonyms
units
. 
Use synonyms
According to
 what is shown, it can be observed that coal fluctuated during the given Linking Words
period
, it started in 1981 with 80 Use synonyms
energy
 Use synonyms
units
, and Use synonyms
then
 it decreased to  40 Linking Words
energy
 Use synonyms
units
. Notable, Use synonyms
it is clear that
 there slight Linking Words
increase
 which is about 60 Use synonyms
energy
 Use synonyms
units
 between 1986 and 1991. 
In terms of natural gas, Use synonyms
it is clear that
 was steady during the Linking Words
period
 between 1981 and 1991, it was approximately 40 Use synonyms
energy
 Use synonyms
units
, there Use synonyms
are
 Change the verb form
is
sharp
 Add an article
a sharp
increase
 in the Use synonyms
period
 between 1996 and 2000, it was about 100 Use synonyms
energy
 Use synonyms
units
.Use synonyms