The line graph shows the levels of production of the three types of fuel in the UK, namely coal, natural gas and petroleum, from 1981 to 2000. In general, the UK experienced increases in its petroleum and natural gas production, with the former being a clear dominant throughout despite noticeable fluctuations, while coal declined dramatically to take the most bottom-line position by the end of the period.
In the timeframe between 1981 and 1991, almost all energy witnessed significant fluctuations, with the only exception being natural gas. In the beginning of the span, there were approximately 86 energy units producing petroleum that then increased slightly towards the end of this period, reaching the total of 100 units. This was followed by the number of power plants producing coal, which initially plunged from 80 to just under 40, before slowly recovering to roughly 60 by the end of the given timeframe. Natural did not almost fluctuated, starting with only 40 power plants in 1981 that went up slowly to about 42 in 1991.
Between 1991 and 2000, petroleum and natural gas continued growing, whereas coal decreased. Petroleum still dominated and reached the number of 140 energy units to the end of the span. Natural gas came next; it reduced the gap between petroleum considerably with 120 plants. Coal, in contrast, experience a noticeable downfall trend and became the least produced energy source in 2000, with only roughly 39 energy units.