The provided line graph delineates the production levels of the main fuels in the UK between 1981 to 2000.
Overall, it can be noted that majority of the fuel production was of petroleum over two decades. Coal was at a decent production rate at the starting, but plummeted over the period. On the other hand, natural gas commenced at a lower pace but reflected a constant and positive growth.
In 1981, petroleum production was highest ranging at just below 100 million tonnes, followed by coal at 80 million tonnes and natural gas at lowest around 40 million tonnes. Moving forward, in 1986, petroleum increased and reached 140 million tonnes of production, similarly as small bump can be noticed in natural gas production taking it just over 40 million tonnes.
Whereas, an eccentric dearth can be seen in coal production just before 1986, where it dropped below 40 million tonnes and revived back to 60 million tonnes in 1986. In 1991, a major dump can be seen in petroleum production as it went to 100 million tonnes.
In 2000, petroleum and natural gas were on a positive growth trend, while coal showed a continuous decline.