The given line graph illustrates the production levels of three primary fuel types in the UK from 1981 to 2000.
Overall, it can easily be noticed from the graph that the production levels of Petroleum was the highest of these three main kinds of fuel in 1981, and this was followed by a considerable fluctuation over the period. Besides, the amount of coal produced experienced a significant decrease. By contrast, although this figure for natural gas was the lowest in almost the period, it increased sharply at the end of the period.
In 1981, the production levels of Petroleum was the highest at around 90 energy units and increased significantly to 140 energy units in approximately 1986, followed by a gradual fall to 100 energy units in 1991. Output levels of coal remained constant in the next two years, at 80 energy units. However, the figure then reached the lowest point in the first half of the period, at 39 energy units although there was a slight increase to 60 energy units after that. Besides, the production level of natural gas remained stable throughout the first part of the period, at 39 energy units.
From the year 1991 onwards, it is clear that the amount of petroleum levels increased significantly and hit a peak in 1999, at around 145 power units. There is a considerable decrease to 36 energy units in 2000. The opposite was true for this figure of natural gas, even though the production level of natural gas was the lowest at the first of the period, it increased significantly at the end of the period.