The provided line graph delineates the number of production levels in primary type of fuel in UK from 1981 to 2000. Looking from an overal perspective, it can be seen that natural gas had a significant increase and petroleum had fluctuated level of production, while coal declined gradually all of the years.
In 1981, Natural gas was produced about 40 energy units, while Coal and Petroleum had around 80 and 90 respectively. Over the following 10 years, the production level of Natural gas was stable and Petroleum fluctuated around 100 units, but Coal saw a decline around over 20 tonnes .
from 1991 to 2000, Production of Natural gas rose considerably around 100 more which was as a peak of Natural Gas production. Afterwards, Petroleum increased significantly approximately 140 in the last years. Compared to Coal production, it droped gradually and it was produced a mere under 40 in the last year.
