The graph illustrates the production levels of the main kinds of fuel in the UK between 1981 and 2000.
Overall, fuel production in the UK had ups and downs from 1981 to 2000. However, it is clear that petroleum had a higher increase in production than natural gas, while coal showed a decrease in output.
Petroleum production started increasing rapidly from 1981 to 1984. For the next 3 years, it remained stable, and 140 units of energy were produced each year during that period. However, in the late 1980s, a big decrease in production happened and lasted for a few years. At the beginning of the 1990s, the rise began and continued until the 2000s.
Natural gas showed slow growth in production. For nearly 10 years, the production level was around 40 energy units per year. After that period, growth happened, and there were no sudden decreases in production.
Production of coal decreased year by year, and it is clear that producers lowered the output of coal. In 1981, production of coal was 80 energy units; meanwhile, in 2000, it was under 40 units.