The pie charts illustrate the portion of different sources producing energy in a particular country from 1985 to 2003. Overall, while the proportion of energy produced by natural gas, coal, hydro, and other unspecified renewable energy sources increased, the reverse was true for that of oil and nuclear. Additionally, the figure for oil stood out among other sources with consistently high figures in each year, despite a decline in the final year.
Focusing on bigger numbers first, in 1985, starting at staggering 52%, the proportion of energy taken from oil declined significantly to 39% in the end of the period. The figure for nuclear accounted for 22% in 1985, before dropping markedly to 8% in 2003. The portion of energy produced from natural gas stood at 13% in the beginning, and this was followed by a dramatic rise to a peak of 23% in 2003.
Turning to the remaining categories, the amount of energy produced from coal started at 8%, after which it grew markedly to 22%, similar to an initial point of nuclear in the end of the year. Subsequently, the share of hydro and other unspecified energy sources accounted for a minimum of respectively 4% and 1% in 1985. In 2003, while the figure for hydro leveled off, the proportion of energy taken from other renewable energy sources climbed marginally to 4% in 2003.