The data illustrates the proportion of central types of fuel produced in the UK in 22 
years
 from 1981 to 2000. From an Use synonyms
overall
 perspective, Linking Words
it is clear that
 petroleum is the most Linking Words
favored
 by the citizens, natural gas witnessed an upward trend, Change the spelling
favoured
while
 coal fluctuated dramatically throughout the period.
 
In 1981, petroleum Linking Words
as well as
 coal production started Linking Words
of 
at around 100 and 80 Change preposition
apply
energy
 Use synonyms
units
. From 1981 to 1987, the trend not only Use synonyms
qualdrupled
 itself but Correct your spelling
quadrupled
also
 reached a plateau for a few Linking Words
years
. Use synonyms
However
, petroleum production slumped rapidly in five Linking Words
years
, once again Use synonyms
started
 from Wrong verb form
starting
crack
 at 100 Add an article
a crack
the crack
energy
 Use synonyms
units
. A decade Use synonyms
after
, the data demonstrates a Rephrase
later
stably
 Change the word
stable
increase
 level. 
Wrong verb form
increased
On the other hand
, coal resources experienced a downward oscillation throughout 22 Linking Words
years
, as Use synonyms
it
 Correct pronoun usage
they
havled
 sharply at under 40 Correct your spelling
halved
energy
 Use synonyms
units
 in the third year from 1981. Contrastingly, Use synonyms
eventhough
 natural gas stayed flat at the early stage, the trend rose steeply from 40 to over Correct your spelling
even though
a 
100 Correct article usage
apply
energy
 Use synonyms
units
.Use synonyms