The line graph illustrates the amount of main fuels produced in a European nation between 1981 and 2000. Overall, petroleum was produced the most among fuels and the figure for it fluctuated greatly. Additionally, coal experienced downward trend while that of natural gas was in reversed.
From 1981, starting at the highest level of 97 tones, petroleum production had increased moderately until it remained stable from 1984 to 1987. After that the figure for it dropped sharply and reach to its first point in 1990. In the first three years, the amount of coal produced saw no change, which stayed at 80 tones. Then, there was a dramatic decrease of 30 tones in 1985 before it grew with slight fluctuation until 1990. Meanwhile, the figure for the remained fuel, natural gas, unchanged at 40 tones.
From 1991 to 1996, the country witnessed a significant growth of petroleum production from its trough to nearly 140 tones. There was a small fluctuation in the next two year before it marginally went down and reach the level of 120 tones in the last year. In contrast, in the same period, the production of coal moderately went down and hit its trough of 40% in 2000. The production of natural gas gradually went up until 1996 before it underwent a sharp increase in the last 3 years.