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

The line graph demonstrates the manufacturing levels of main fuels in a European country from 1981 to 2000.

Overall

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,

it is clear that

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petroleum and coal varied throughout the given span,

whereas

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natural gas remained stable before rising slightly.

According to

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the petroleum

, it

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industry, it

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started as the dominant figure in the initial year. It experienced a slight increase before levelling off in 1987.

However

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,

this

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figure declined sharply

at the end

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of 1991. After that, there was a dramatic increase in 1995. In the final years, it fluctuated and finished with 120

tonnes

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. In terms of coal, after a stable production from 1981 to 1983, it experienced a slight dip in 1985.

Nevertheless

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, it climbed noticeably by the end of 1987, but

then

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fell steadily year after year, and ended with 40

tonnes

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of production.

While

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petroleum and coal witnessed fluctuations throughout the 20-year period, natural gas began with only 40

tonnes

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of production; still, despite beginning with the lowest proportion, it remained robust until 1994. After that, it grew considerably to 83

tonnes

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by the end of the period.