The line graph illustrates how changed the production of three main sources of fuel, including petroleum, coal, and natural gas in the UK between 1981 and 2000.
Overall, it can be clearly seen that petroleum was the most required fuel among three, which had fluctuation over the given period. Coal experienced a steady decline, while the production of natural gas increased gradually.
As for the manufacture of petroleum, it was recorded at just below 100 energy units (EU) at the outset of the period, in 1981, after which it remained steady, reaching at 140EU for roughly three years. Then it fell dramatically to its first pointin 1991, which is equal to 100 units. The figure climbed sharply to approximately 144 EU and stayed steady until the end of the period.
In terms of coal production, in 1981, it began with about 80 EU and decreased by half to 40. In five-year period, it rocketed to 60 units. Then it saw a gradual reduction until the end of the timeline. When it comes to the manufacture of natural gas, it had seen a steady rise, beginning from 40 EU, ending with about 110 EU.