The line graph illustrates how the production of the three main fuels in the UK has changed from 1981 to 2000. According to the data, it is clear that petroleum was the major kind of fuel produced over the period, while coal and natural gas had a lower level of production.
Natural gas level remained steady, around 40 million tonnes, from 1981 to 1991, when the level doubled to 80 million tonnes, by 1996. Then, it slightly increased to 100 million tonnes by 2000. On the contrary, coal production experienced a downward trend over time: although the level was higher than that of natural gas in 1981, around 80 million tonnes, coal fell to less than 40 million tonnes by 1984, before a little growth to 60 million tonnes by 1986. It remained steady until 1989, before falling again to around 40 million tonnes in 1995. By 2000 it slightly decreased to less than 40 million tonnes.
On the other hand, even if petroleum had the highest level overall, it fluctuated over the period: starting from almost 100 million tonnes in 1981, it significantly increased to around 140 million tonnes by 1984, before remaining steady until 1987. Then, it considerably fell to 100 million tonnes in 1990. After that, the level of petrol raised rose again to 140 million tonnes by 1996, remaining quite steady until 2000.