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The image depicts a line graph showing energy units from 1981 to 2000, where 1 energy unit equals the energy from one million tonnes of oil; petroleum starts around 70 units in 1981, peaks near 160 units in 1985, dips to 120 units in 1991, rises to 140 units in 1996, and ends around 135 units in 2000; coal starts near 90 units in 1981, declines to 40 units in 1986, maintains until a slight rise to 50 units in 1998, and ends just below 50 units in 2000; natural gas starts around 40 units in 1981, steadily ascends to 80 units in 1990, slightly fluctuates and continues upward to 120 units in 2000.
Given the complexity of the image, the above description may not be entirely accurate.
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This graph compares the figures for the production level of petroleum, coal, and natural gas in the United Kingdom over 19 years.
Overall, of those three kinds of fuels, petroleum has the highest production compared to coal and natural gas.
The production of petroleum in 1981 started below 100, perhaps 90 units. Between 1981 and 1984, there was an increase in the production of petroleum to 140 units. Then, the production of petroleum maintained a steady level until 1987, when it suddenly reduced to 100 units in 1990. In the next two years, production of petroleum managed to climb back to 140 units in 2000. Next, the production of natural gas has an increasing trend from 40 units in 1989 to 100 units in 2000. On the other side, the number production of coal has experienced a decreasing trend from 60 units in 1986 to perhaps 35 units in 2000.
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