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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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The graph contains information on the production levels of petroleum, coal, and natural gas in the UK between 1981 and 2000.
Overall, of those three kinds of fuels, petroleum had the highest number of production compared to coal and natural gas.
The production of petroleum in 1981 started below 100 units, approximately 90. Between 1981 and 1984, there was a significant increase in the production of petroleum to 140 units. Since then, the production maintained a steady level until 1987 when it plummeted to 100 units in 1990. In the next two years, the production of petroleum managed to climb back up to 140 in 2000. An increasing trend in the production of natural gas began to take off from 40 in 1991 to 100 in 2000. On the flip side, the production of coal experienced a declining trend. The number production of coal was 80 in 1981 and kept decreasing to approximately 35 in 2000
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