The two pie charts demonstrate how the proportion of energy which was produced by various sources – oil, natural gas, coal, hydrogen, nuclear, and unspecified renewable – in a certain country from 1985 to 2003.
Overall, oil emerged as the biggest energy generator in both years – albeit witnessing a decline – being far higher than others. It is also evident that the percentage of energy made by natural gas, coal, and unmentioned sources saw an upward trend, whereas the reverse was true for the remaining ones apart from hydrogen, which stayed the same during the period.
In 1985, oil produced the largest amount of energy, accounting for a half or more of total energy (52%), distantly followed by nuclear sources, at 22%. The share of energy generated from natural gas made up 13%, which was equal with the blend share of the three others, coal – 8%, hydrogen – 4%, and unspecified one – 1%.
Over the years, the biggest segment in terms of energy production was still made by oil, in spite of a decline to 39%, which was threefold as high as the proportion coal energy. The figure for natural gas had seen a rise of 10% by 2003, which made it the second biggest energy producer, while the share of nuclear power decreased to 17%. Although the percentage of energy by hydrogen remained stable, unclear renewable sources became equal with it as a result of a rise by three percentage points.
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