The pie charts compare the share of energy created from six resources in the same nation between 1985 and 2003.
Overall, it can be seen that natural gas consistently made up the largest proportion among the six resources in both years. Furthermore, the energy generated from coal, oil, and other renewable resources rose, whereas an opposite trend was seen in the figures for natural gas and nuclear power, and that of hydrogen remained stable over the 18-year period.
In 1985, energy generated by natural gas accounted for more than half of the total. In the next 18 years, this figure remained dominant, despite experiencing a decrease to 39%. The proportion of energy production by coal was 8% at the starting point, then growing significantly to 22% in 2003. A similar trend was seen in the figure for oil, which increased considerably from 13% to 23%. By contrast, nuclear power showed a noticeable decrease in the amount of energy produced by more than half – from 22% to 8% between 1985 and 2003.
In terms of other resources, starting at 4% in 1985, the proportion of energy generated by hydrogen remained completely unchanged until 2003. Other renewable resources constituted only 1% at the beginning; then, this figure showed a fourfold increase to 4% in 2003.