The graph illustrates the level of production of the main fuels in a specific country during the twenty year period.
In summary, in 1981, petroleum was the main fuel which was produced in largest quantity and it further increased in the 2000. Conversely, natural gas was the least produced but it’s production improved significantly over the years. Meanwhile, coal was the second largest source but it gradually showed a declining trend.
In the year 1981, petrol was produced at a high rate approximately 90 energy units then it gradually increased to 140, but in 1986, it remained still. However, it again fell to 100 before again increasing to 140 in 2000. In contrast, coal showed the marked growth gradually from 40 units to 100 units.
On the other hand, Coal was the second highest produced fuel in 1981 at 80 energy units, but it’s production significantly decreased to 40 in 1984, before again improving to 60 in 2 years, then it’s graph showed a downward trend to around 30 units in 2000.