The two pie charts illustrate the changes in the percentages of different resources used to generate energy in the country from 1985 to 2003.
Overall, in both eras, oil was the dominant resource used for energy production. Nuclear resources were the second largest energy resource in the first era, but were replaced by natural gas in the second era. Unlike the first era, coal became the third largest resource in the second era. In both years, the other resources were used sparingly.
In 1985, oil was the dominant resource in energy production, with 52%, respectively. The second largest resource used for it was nuclear resources, with 22% in this period. In the ranking of the top three energy-producing resources,Natural gas took third place in the ranking of it with 13%. Coal, hydro, and other resources were used minimally for energy generation, 8% coal, 4% hydro, and 1% others, respectively.
With a 17% decline in 2003, the oil resource maintained its position in energy production. Unexpectedly, coal overtook nuclear during this time, increasing by almost 3 times and taking second place in energy production. Natural gas supplies increased by 10 percent compared to the previous year, making it the third largest energy resource. Unlike the previous year, this year nuclear resources were used less, decreasing by almost 3 times. Hydro and other sources showed the same 4% percentage increase, which was a very small increase compared to the previous era.