The line graphs illustrate the production levels of main fuels in a European nation from 1981 to 2000.
Overall, Petroleum and Natural Gas witnessed an upward trend in production while Coal was the opposite. Moreover, Natural gas had the biggest increase whereas Petroleum stood at the highest level throughout the period.
Regarding Petroleum, the production started at around 90 million tonnes in 1981 and rose sharply to about 140 million tonnes in 1985. It then declined steeply by 40 million tonnes in 1990 before recovering rapidly, reaching over 140 million tonnes in 1996. From that point onwards, Petroleum’s production fluctuated slightly and finished at the highest level among three main fuels. Turning to Natural Gas , commencing at the lowest point, it remained unchanged from 1981 to 1988, followed by a significant growth in 1989, before ending the period at around 100 million tonnes. By contrast, Coal production fell from 80 million tonnes in 1981 to below 40 million tonnes in 1984. It then increased slowly to 60 million tonnes by 1986, followed by a gradual decrease to under 40 million tonnes in 1994. Coal production then remained relatively stable and finished at the lowest level among the three main fuels.