The given line graph illustrates the variations in the production levels of coal, natural gas, and petroleum in the UK from 1981 to 2000, measured in energy units.
Overall, the production of coal experienced a consistent decrease, while natural gas production showed a significant increase over the period. In contrast, petroleum production exhibited fluctuations but generally maintained a relatively stable level.
To begin, coal production started at approximately 120 units in 1981 and gradually declined to just under 40 units by 2000. This represents a substantial decrease over the two decades. Conversely, natural gas production began at less than 40 units in 1981 and soared to over 100 units by the end of the period, indicating a dramatic rise. The remarkable contrast between the trajectories of coal and natural gas production is evident, with coal showing a continuous decrease and natural gas displaying a remarkable increase.
Turning to petroleum, its production fluctuated between 60 and 100 units throughout the period. Despite the variations, petroleum production remained within a relatively stable range. It peaked at around 100 units twice, in 1985 and 1998, while reaching its lowest point just below 60 units in 1991. Despite these fluctuations, the overall production level of petroleum remained relatively constant when compared to the substantial changes in coal and natural gas production.