The given line graph illustrates the production levels of petroleum, coal, and natural gas in the UK from 1981 to 2000.
Overall, the production levels of the three main fuels in the UK experienced fluctuations over the two decades. Petroleum was consistently the highest produced fuel, followed by coal and then natural gas. Petroleum production peaked at 160 million tonnes in 1999, coal production decreased from 80 to 20 million tonnes, while natural gas production increased from 20 to 100 million tonnes.
Petroleum production in the UK started at around 90 million tonnes in 1981, saw a significant increase to 140 million tonnes in 1984, remained stable for three years, then gradually declined to 100 million tonnes by 1990. However, it showed a continuous upward trend thereafter, reaching a peak of 160 million tonnes in 1999.
In contrast, coal production began at 80 million tonnes in 1981, with natural gas contributing nearly half of that amount. By 1983, coal production dropped to just below 40 million tonnes, while natural gas production steadily increased to slightly above 100 million tonnes. Coal production recovered to 60 million tonnes in 1986 but experienced a downward trend over the rest of the period.