The provided graph illustrates the level of various fuel production in particular country over the period from 1981 to 2000.
Overall,the production of petrolium represented the highest proportion with some fluctuations throughout the period, while the rest of productions were relatively small.
The figure related to natural gas shows a sustainable growth over the period, however, in 1981 to 1991 there was a plateau with slight increase at the end of the period from around 38 to over 40 points. Afterwards, from 1991, the production experienced considerable growth and reached a peak at 100 points in 2000.
The output of coal from 1981 to 1988 plunged from 80 points to below 40 points, but then restored to 60 pints and after minor plateau period, it remained decreasing to about 40 points till the end of the period.
The trend related to petrolium experienced fluctuation over the period and achieved the highest numbers over 140 points in 1999.
