The graph below shows the production levels of main fuels in a European country from 1981 to 2000.

The line graph details the

production

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of three different fossil fuels in an unspecified country between 1981 and 2000. Looking at the graph from an

overall

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perspective,

it is clear that

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the

production

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of petroleum and coal followed an erratic pattern,

whereas

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natural gas stayed at the same

production

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level for most of the period. Among

three

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the three

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types of fuels researched, petroleum always headed the list of

production

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levels. In 1981, the amount of petroleum being produced was around 100

tonnes

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. It increased steadily over the next few years to reach around 130

tonnes

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before dropping back to just under 100

tonnes

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in 1989. It

then

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rose

up

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again to around 130

tonnes

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in 1995, where it fluctuated slightly until the end of the period. Coal was the second most produced fuel in 1981, at 80

tonnes

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. Coal

production

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remained constant until it dropped suddenly down to around 50

tonnes

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in 1985. It rose back up to just over 70

tonnes

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in 1987 before slowly declining over the next 13 years to just under 40

tonnes

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. The

production

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of natural gas remained unchanged at about 40

tonnes

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until around 1991 when it began to rise exponentially.