The pie charts compare the percentage of various sources in terms of producing energy in a specific country in the years 1985 and 2003.
Overall, natural gas, coal, and other renewable sources experienced an increase throughout the period, while hydrogen category remained unchanged. Additionally, oil, and nuclear sections saw a decline, with the former retaining its dominance in both years, while the latter falling from the second to the third rank.
In detail, although natural gas accounted for 13% of the total energy in 1985, this rate significantly rose, reaching 23% in 2003. As for coal, its rate was 8% in the first year, before growing to 13% in the second year. Also, other renewable sources, which comprised the smallest proportion of total energy, experienced a rise from 1% to 4% during the time frame.
Regarding the sections which saw a decrease, oil was the dominant category, constituting 52% of the total energy in 1985. Subsequently, in 2003, this proportion considerably dropped to 39%. Notably, nuclear category markedly declined, falling from 22% to 17%. Finally, hydrogen section stagnated at 4% in both years.