The given pie charts compare the percentage of energy generated from various sources in a particular county from 1985 to 2003.
Overall, though the percentage of oil decreased over the period, it remained the highest proportion. However, the proportion of natural gas, coal, and other renewables increased throughout the period, while the percentage of nuclear decreased.
Oil was the major source of energy production throughout the whole period, although its usage dropped from just over a half (52%) in 1985 to approximately two fifth (39%) in 2003. The use of nuclear also declined from 22% to 17% over the given period.
The use of natural gas and coal showed an increase from 13% and 8% in 1985 to 23% and 13% respectively in 2003. Interestingly, the proportion of energy produced from hydrogen remained stable at 4%, whereas that from other renewable sources increased from 1% to 4% over the given period of 18 years.
