The line graph illustrates the production levels of three kinds of fossil fuel in the UK from 1981 to 2000.
Overall, while the levels of petroleum and natural gas increased remarkably, the opposite was true for coal in the given period. Also, no fuel was produced more than petroleum.
In 1981, the number of tons of generated petroleum stood at over 90 energy units, in the leading place. At the same time, the figure for natural gas was at the lowest point, with 40. Between 1981 and 2000, the production level of dark oil witnessed a rise by 50 units in 1986, before declining to the old position (about 100) and then increasing to 140 from 1996 to 2000. Meanwhile, a huge amount of produced natural gas increased steadily by 60 units.
From that point on, 80 energy units of coal were manufactured in 1981. This number began reducing by half in the next few years. Although rising to level 60 by 1986, the figure for coal experienced a significant fall by 20 units