Firstly, the graph below present information about manufacture level of the most popular fuels in UK between 1981 and 2000. For easily way to compare, the graph divided on three types of main fuels: petroleum, coal, natural gas.
These data shows a constant dominate in frequency of using petroleum, it continues for the all timeframe between 1981 and 2000. Moreover production level of coal had reduced in 1983-1986 timeline, also the more graphic of natural gas near with 2000 the more increase production level of this fuel, at the same time coal was becoming more and more unusual in manufacture.
From 1981 to 2000 petroleum was being the most useful and popular, for this time it changes from 90 (level of production) to 145, when other fuels had level range from 35 to 100. In 1984 popularity of using coal had sharply went down, this gap between 1983 and 1984 about 40 measures of producivity level, other words it is about 50 percent reduced of common using coal. Natural gas is becoming more and more popular, it had breakthrough between 1981 and 2000 ranged like 35-100 measures. When at the same time graphic of coal reducing more and more: from 80
The last two decades of 20th century saw like petroleum permanently relevance and more and more popular becoming a natural gas.