The line graph illustrates the production levels of the main types of fuel in the UK from 1981 to 2000.
Overall, petroleum had the highest production levels in 1981 and maintained this position throughout the period. Initially, natural gas had the lowest production level among the three fuels, but by 1992, it surpassed coal production and secured the second position by the end of the period.
In 1981, petroleum production levels started at around 90 energy units, sharply increasing to approximately 140 units within 3 years. It then plateaued for some time before decreasing to around 100 units by 1990. Subsequently, there was a year-on-year increase in production levels, peaking just above 140 units and remaining around that level until the end of the period.
Coal production started as the second highest at around 80 units. It experienced a dip in 1984, dropping below 40 units. Despite a recovery, there was a declining trend in coal production over time. In contrast, natural gas production hovered around 40 units before surging past coal production in 1992 and peaking just above 100 units by the end of the period.