The line graph compares the production levels of three major types of fuel-petroleum, natural gas, and coal-in the UK between 1981 and 2000, measured in energy units.
Overall, petroleum remained the dominant fuel throughout the entire period, despite experiencing notable fluctuations. In contrast, natural gas production rose steadily and significantly, while coal output showed an overall downward trend after a brief recovery in the mid-1980s.
In 1981, petroleum production stood at approximately 90 energy units and increased sharply to around 140 units by 1984. Although it declined to about 100 units in 1991, output subsequently recovered, reaching roughly 140-145 units in the late 1990s before ending slightly lower in 2000.
Natural gas, by comparison, began at a much lower level of around 40 energy units in 1981. Its production remained relatively stable during the first decade, but from the early 1990s onward it rose rapidly, ultimately peaking at approximately 100 energy units by the end of the period.
Coal production started at close to 80 energy units in 1981 and fell dramatically to around 35 units in 1984. Although it rebounded to nearly 60 units by 1986, coal output then declined steadily, finishing at just over 30 energy units in 2000.