The line graph compares the production levels of petroleum, coal, and natural gas in the United Kingdom between 1981 and 2000.
Overall, petroleum and natural gas production both showed significant increases over the period, despite some fluctuations in petroleum levels.
In 1981, petroleum production started at around 90 energy units and rose sharply to nearly 140 units in 1986. After dropping back to 100 units in 1991, it recovered quickly to reach a peak of about 145 units in 1999, before ending the period slightly lower. Meanwhile, natural gas production began at the lowest position of nearly 40 units. It stayed relatively stable during the 1980s but grew rapidly from the early 1990s onward, reaching exactly 100 units in 2000.
In contrast, coal production followed a volatile but downward path. It started at 80 units in 1981 but plummeted to a low of about 35 units in 1984. Although it rebounded to 60 units in 1986 and stabilized until 1990, coal production decreased steadily over the remaining years, finishing at just under 40 units.
