The line chart illustrates the proportion of the generation of three integral types of fossil fuel (calculated in tonnes) in the UK over a nighteen-year span, with a commence in 1981.
Overall, there was a gradual increase in the figure for natural gas production, whereas the trend for producing coal enxperienced a marginal decline. In addition, the amount of petroleum production notably fluctuated, but consistently represented the largest proportion among three sources of energy throughout the observed peoriod.
Over the period of four years beginning in 1981, the amount of coal production remained unchanged at 80 tonnes, which was more than double that of natural gas. This figure dropped to about 50 tonnes in 1985 and then significantly rose to nearly 73 tonnes, followed by a gradual fall by the end of the period. Meanwhile, natural gas production remained stable until 1994, then slightly go up and converged coal production at 50 tonnes, after which there was a dramatic surge in the figure for natural gas, rocketting to its peak at over 80 tonnes.
In 1981, the graph registered below 100 tonnes in petroleum generation. This figure climbed by approximately 35 tonnes in the ensuing years but then recovered to the innital level in 1989 and slightly descended to 95 tonnes. The year 1993 saw a significant rise of 40 tonnes in the amount of petroleum production and this proportion hovered at this level until 2000.