The line graph illustrates the amount of three petroleum, coal, and natural gas which was produced in the UK from 1981 to 2000. Overall, the production levels of petroleum and natural gas witnessed an upward trend whereas the figure for coal declined dramatically throughout the surveyed period.
As can be seen, in 1981, roughly 90 tonnes of petroleum was manufactured, which was two-fold natural gas (40 tonnes), before increasing significantly to just below 140 tonnes in 1884. Afterward, there was a fairly unchanged period until 1987 and then dropping sharply by 40 tonnes to 100 tonnes in the next three years. From this point, the level of petroleum produced peaked at approximately 150 tonnes in 1999 prior to dipping to around 145 tonnes in 2000 which has taken the lead in fuel manufacturing during the 19-year period. Likewise, after rising gradually to nearly 45 tonnes in the first decade, the amount of the production of natural gas has rocketed to 100 tonnes by 2000.
Conversely, coal production stood at 80 tonnes in 1981 that thereafter falling noticeably to under 40 tonnes in 1984. Having recovered marginally to 60 tonnes in 1986, the figure for coal stayed the same in the next three-year period. Subsequently, it saw a steady decrease to hit a low of less than 40 tonnes in 1996 and level off in the last 4 years.