The pie charts compare the shares of energy taken from both renewable and non-renewable sources in a country in two separate years, 1985 and 2003.
Overall, it is clear that non-renewable sources were responsible for the vast majority of energy produced. The irony is that petroleum was a solo dominant source of energy in both years.
Upon a detailed look, in 1985, oil made up more than a half of the energy produced while just under a quarter of energy production came from nuclear energy. Also, 13% and 8% of energy was derived from the other two fossil fuels: natural gas and coal, respectively. The proportion of hydro-energy was as four times as that of other renewable sources.
Coming to the year of 2003, energy production underwent rapid changes. Although water power did not show an alteration in its proportion, the quite opposite is true for the index of other renewable sources, which had seen a fourfold change from 1% to 4%. Interestingly, the sum of the proportions of gas and coal energy was not as high as the percentage of oil in the previous year while the data on 2003 energy production showed a complete reverse with the figures hovering around the mid-20s and 39% in turn.