The pie graphs illustrate the percentage of engery produced from numerous resources in one nation over a 18-year, commencing from 1985.
Overall, it is evident that natural gas consistently exceeded other energy sources. Notably, nuclear energy and natural gas witnessed a downward trend, contrasting with coal, oil energy and other renewables. Meanwhile, hydrogen production, which remained relatively stable throughout the period.
To be more specific, natural gas accounted for 52% in 1985, being the highest rate in the chart, dramatically greater than nuclear production with just 22%. Over the subsequent 18 years, despite having experienced a significant drop to 39%, the former still led with 39%. While the latter diminished remarkably by 14%, marking a rapid decrease from its initial figure. In addition, hydrogen energy remained the plateau from 1985 to 2003 (4%).
Turning to the remaining categories, oil production made up 13% in 1985 while the proportion of coal energy was smaller at 8%, compared to 1% of other renewables. At the end of the period, coal and oil energy increased noteworthly nearly the same level, 22% and 23%, respectively. Finally, the same trend can be seen in other renewables, it rose gradually to 4% in 2003.