The graph illustrates 
UK's
 Correct article usage
the UK's
production
 levels of Use synonyms
petroleum
, coal and natural gas between 1981 and 2000. Use synonyms
Overall
, Linking Words
petroleum
 has the highest Use synonyms
production
 between 1981 and 2000. Use synonyms
On the other hand
, coal had the lowest Linking Words
production
 rate in 2000. 
In 1981, Use synonyms
petroleum
 had the highest Use synonyms
production
 level with approximately 90 Use synonyms
million
 Use synonyms
tonnes
 generated. Use synonyms
Creation
 of Correct article usage
The creation
this
 fuel has been steadily increasing, Linking Words
however
, there was a significant decrease in the Linking Words
production
 of Use synonyms
petroleum
 around 1990. Use synonyms
After 
Linking Words
this
 decline, manufacturing Linking Words
Use synonyms
petroleum
 is steadily increasing with a peak of approximately 145 Change preposition
of petroleum
million
 Use synonyms
tonnes
 produced around 1999 and has remained the highest produced fuel in 2000. 
The creation of natural gas has been on a steady increase since 1981 with almost 40 Use synonyms
million
 Use synonyms
tonnes
 and has peaked around 2000 with a little over 100 Use synonyms
million
 Use synonyms
tonnes
 of oil produced.  Use synonyms
On the contrary
, coal Linking Words
has
 80 Wrong verb form
had
million
 Use synonyms
tonnes
 manufactured in 1981 but had a sharp decline in Use synonyms
it
 Correct pronoun usage
its
production
 around 1982 with only less than 40 Use synonyms
million
 Use synonyms
tonnes
 created. Use synonyms
After 
Linking Words
this
 decline, it steadily Linking Words
increasing
 to 60 Wrong verb form
increased
million
 Use synonyms
tonnes
 produced in 1986. It had Use synonyms
plateaud
 until 1989 when Correct your spelling
plateaued
plateau
production
 slowly Use synonyms
decreases
 and around 2000's Wrong verb form
decreased
it's
 Replace the word
its
production
 was at its lowest with only around 35 Use synonyms
million
 Use synonyms
tonnes
 produced.Use synonyms