The graph illustrates information about the production levels of the main kinds of fuel in the United Kingdom (UK) from 1981 to 2000.
Over the whole period of time, the number of natural gas usage rises steadily. On the other hand, the levels of petroleum fluctuated; it reached the lowest point in 1991. Then, it increased significantly, although it slightly declined twice in around 1996 and in 2000. The averrage kinds of coal, in contrast, steeply declined once, and in 1996 onward it remained the same.
In 1981, the levels of natural gas started at the very lowest points, which is 40 million tonness of oil compared to other kinds of fuel. The levels of coal started at almost more double than the levels of the natural gas, and the average of petroleum started at the highest point at about 90 million tonness of oil.
The number of petroleum that was started at the peak amongst others experienced decrease dramatically at the level of 100 million tonness of oil in 1991, which almost as the same as its started point ten years ago.