The line graph illustrates the output levels of the basic types of fuel in the Uk from 1981 to 2000, measured in energy units.
Overall, the production of petroleum rose significantly over the period, whereas coal showed a clear downward trend. In contrast, natural gas remained stable but exceed at the end of the period.
At the beginning of the period, petroleum production stood around 85 energy units and increased to 140 units in 1983 before falling dramatically to about 100 energy units. It displayed steady growth in last decade. Unlike, coal was yield approximately 80 energy units in first three years, after which the figure fluctuated slightly and dropped to a low point of almost 30 units in 2000.
On the other hand, natural gas output stayed constant at around 39 energy units for the first decade, then experienced a gradual increase in the following years and peaked at just over 100.
