The line graph compares the production levels of the three primary kinds of fuel in England from 1981 to 2000.
In general, while petroleum and natural gas witnessed a significant increase in their production levels, only the figure for coal declined. Additionally, petroleum maintained its top position during the examined period.
In 1981, petroleum was the leading fuel, registering roughly 90 energy units, which was closely followed by the figure for coal, with about 80 energy units. There was a marked disparity between coal and natural gas, with the production level of the former being double that of the latter. Subsequently, petroleum peaked at 1984, with approximately 140 energy units, after which it dropped to just over 100 energy units in 1991. By contrast, coal reached its lowest position in 1984, registering around 40 energy units, before rising again and plateaued at nearly 60 energy units in 1991. During this period, a levelling out was observed in the figure for natural gas.
Afterwards, petroleum and natural gas experienced a considerable growth, ending the period with about 140 and 100 energy units, respectively. However, a gradual decline was witnessed in the figure for coal, falling to around 40 energy units in 2000, making it the least produced among the three kinds of fuel.