The chart illustrates how the volume of three types of fuels produced in a particular European country between 1981 and 2000. Overall, the production level of petroleum fluctuated and was the highest figure throughout the period shown. In addition, that of coal saw a dramatic decline, while the figure for natural gas was on the opposite trend despite stabilising over the two first decades.
At the start of the period, petroleum was the most produced at nearly 100 tonnes, compared to 80 tonnes coal. Thereafter, the volume of petroleum grew to 120 in 1984, remaining there for about three years before reaching a low of 90 in 1991. Meanwhile, the coal production level stayed static in the first three years, then it had fallen rapidly and reached a low of 50 tonnes by 1985. Despite recovering to 70 in 2 years after, it was still on a downward trajectory until 1991.
From 1991 to 2000, the petroleum production volume recovered and two times reached a peak of 130 tonnes in 1995 and 1997, afterwhich it fell and ended at 120 tonnes. In contrast, the volume of coal manufatured continued sliding until hitting an all-time low of 40 tonnes, three times lower than that of petroleum, at the end of the period.
Finally, natural gas started as far less produced type of fules compared to the others, at 40 tonnes. It experienced a stability throughout the first decade. However, it started to grow steadily and finished at about 85 tonnes in 2000, which makes it ranked second.