The graph predict the production levels of the main kinds of fuel which are Petroleum, Coal and Natural gas in the years between 1981 and 2000 in the United Kingdom. In this graph, the highest level of fuel is Petroleum and the Coal has the lowest.
Between 1981 and 1984 the level of the energy units of the petroleum was increased from 90 to 140 energy units. However, the level of the units decreased from 140 to 100 in years between 1987 and 1990. Appearently, between 1984 and 1987, also between 1995 and 2000 the level of the energy units did not change approximately.
Coal was the fuel that the production level of the energy unit had changed the most. The level went from 80 units to 40 in almost 2 years. Then, between 1984 and 1986 it decreased from 40 to 60 units. From 1989 to 2000 the production of the coal decreased from 60 to approximately 30 energy units.
In the years between 1981 and 1990 the production level of Natural gas did not change. From 1990 the level increased very highly in 10 years until 2000. It increased from 40 energy units to 100.