The two pie charts illustrate the changes in the percentage of energy generated from six distinct sources in a specific country between 1985 and 2003.
Overall, oil was the most significant energy source in both years, although its contribution fell markedly over the period. Conversely, there was a clear shift towards greater reliance on natural gas, coal, and other renewable sources, while nuclear energy experienced a decline.
In 1985, oil accounted for more than half of the total energy production at 52%. By 2003, this figure had dropped to 39%, though it remained the largest single source. Nuclear energy was the second most prominent source in 1985 at 22%, but this proportion decreased to 17% by 2003. Hydrogen energy remained stable, contributing 4% of the total in both years.
In contrast, other sources saw growth. Natural gas production rose from 13% in 1985 to 23% in 2003. Similarly, the share of coal increased from 8% to 13% over the same period. Finally, the contribution of other renewable sources quadrupled, rising from a negligible 1% in 1985 to 4% by 2003.