The line graph depicts the quantity of main fuels in a European nation between 1981 and 2000. In general, all the categories except Coal showed an upward trend, whereas Petroleum outweighed other fuels.
Initially, Petroleum started with nearly 100 tonnes of production, 2.5 times greater than Natural gas. After that, it significantly increased and remained at approximately 130 tonnes between 1984 and 1988. Then, it sharply declined to around 90 tonnes in 1991 before rapidly increasing quickly till the end of the final decades of the 21st century. Finally, it reached exactly 120 tonnes in 2000, which tripled Natural gas figures at the same time
Otherwise, both Coal and Petroleum had reached a plateau for the first 5 years, and the production of Coal was as high as 2 times that of Natural Gas. After 1985, Coal suddenly plummeted and sharply rose to 70 tonnes 2 years later. Then it gradually dropped in the rest of the period, lowering by 40 tonnes a bit in 2000. On the other hand, in the mid of 90s, the quantity of Natural Gas rocketed and kept an upward trend till the end of the 21st century, when it got 80 tonnes