The pie charts illustrate the percentage of energy produced from different sources in a country between 1985 and 2003.
Overall, it can be seen that oil was the most essential source for the production of energy over the period shown. Moreover, other sources, such as natural gas and nuclear, were also in demand for the production of energy.
In 1985, oil was responsible for 52% of the energy that was being produced. Other natural sources like nuclear were used widely for the production of energy, producing 22% of the energy. Natural gas and coal were also significant factors, producing 13% and 8% of the energy, respectively. Conversely, other sources like hydro and renewables were less in demand, producing only 4% and 1% of the energy.
In 2003, oil use declined slightly, decreasing to 39%. In fact, other remaining sources rose in demand. In 1985, coal was producing only 8% of the energy, but in 2003, the production rose to 22%. Similarly, natural gas was responsible for 13% of energy, but in 2003, it increased to 23%. Although nuclear was an active source for the production of energy in 1985, it decreased to 8%. The remaining two natural sources were both 4% in 2003.