The given pie charts compare the percentage of energy produced in terms of five different sources in one particular country between two years in 1985 and 2003.
Overall, it is immediately clear that there was an upward trend in proportion of energy produced in Natural gas and coal. Although the production rate of oil and nuclear energy sources saw a decline over the given times, the rate in hydroelectric power still took the lead from the list.
As can be seen from the data, there was slight changes in portion of oil and nuclear sources in 2003. In 1985, the percentage of oil was higher than the figure in 2003, with 52% in 1985 and 39% in 2003. This trend was similar to the figure in nuclear energy which decreased gradually to 17% in 2003.
In contrast, in 2003 the portions of coal and natural gas witnessed a dramartical growth. In 1985, standing at 8% and 13% of total energy produced, a significant increase to 13% and 23% for coal and natural gas, respectively. Finally, the rate of production in hydroelectric power remained stable at 4% in 2003.