The line graph shows changes in the levels of how many million tons of oil (Petroleum, Coal and Natural gas) were generated in an unspecified European country between 1981 and 200. Overall, the figure for Petroleum and Natural gas saw a noticeable increase, with former being the most produced fuel in this country, despite fluctuations throughout, while the reverse was true for Coal.
Petroleum was by far the biggest produced type of fuel over the years given. In 1981, the production of Petroleum, after reaching its peak at 130 in the following years, fluctuated moderately between 130 and 100 throughout the period, to finish at exactly at 120 in the final year, still ahead of the other two types of oil by a huge margin.
The remaining two sources of fuel – Coal and Natural Gas – were produced in much smaller quantities. Starting at 80 in 1981, the former remained stable for around half a decade, after which it substantially dropped to approximately around 50 in 2000, despite a slight increase from 1990 and 1995. The figure for Natural Gas, which was the least-produced type of fuel for almost two decades, held steady at 40 before soaring to well over 80 by the end of period, to eventually surpass the production of Coal.