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

The line graph details the

production

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

overall

perspective,

it is clear that

the

production

of petroleum and coal followed an erratic pattern,

whereas

natural gas stayed at the same

production

level for most of the period. Among

three

Correct article usage

the three

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types of fuels researched, petroleum always headed the list of

production

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

tonnes

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

tonnes

before dropping back to just under 100

tonnes

in 1989. It

then

rose

up

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again to around 130

tonnes

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

tonnes

. Coal

production

remained constant until it dropped suddenly down to around 50

tonnes

in 1985. It rose back up to just over 70

tonnes

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

tonnes

. The

production

of natural gas remained unchanged at about 40

tonnes

until around 1991 when it began to rise exponentially.