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