The given line chart illustrates the manufacturing levels of three types of fuels produced in a European country, including petroleum, coal, and natural gas, from 1981 to 2000.
Overall, while there was a noticeable growth in the petroleum and natural gas production, a reverse trend was seen in the figure for coal. Notably, petroleum production remained the highest figure over time, whereas the production level of coal was soon surpassed by that of natural gas in the latter examined period.
Delving into specific for the amount of petroleum produced, it initially started off at just under 100 tonnes. After three years, roughly 130 tonnes of petroleum were yielded and it remained consistent at this figure for the next four years before plunging to under 100 tonnes by 1992. For the remaining period, petroleum production rose markedly to more than 130 tonnes by 1998 before experiencing a slight decline of 30 tonnes at the end of the period.
In terms of the remaining fuels, followed by the figure for petroleum is coal production with approximately 80 tonnes in 1981. For the next three years, it remained unchanged before decreasing rapidly to marginally 50 tonnes by 1985. Even though there was a noticeable rise of 20 tonnes in this figure by 1987, coal production gradually declined to just under 40 tonnes in 2000. Meanwhile, despite remaining relatively stable from 1981 to 1994, there was a significant growth of 40 tonnes in natural gas production by 2000, surpassing and doubling the figure for coal at the end of the period.