The pie charts display data about fluctuations in the proportion of energy supplied from specific types of resources in one country between 1985 and 2003.
Overall, the shares of oil and nuclear power generally decreased, whereas the rates of coal and natural gas increased throughout the period.
In 1985, the proportion of oil, with an approximate value of 52%, was the highest among all types of resources, before the value slightly declined to under 40% at the end of the period. Similarly, the rate of nuclear power was roughly 22% at the beginning of the period and fell sharply to around 8% by 2003.
Nevertheless, the proportion of coal was roughly 8% in 1985, before the number significantly rose to under one-fifth of all produced energy by the end of the period. Similarly, the share of natural gas was 13% and gradually rose to over 20% by the end of the period.
Regardless, the shares of hydro and other renewable resources, with values of 4% and 1%, respectively, were the lowest among all resources in 1985; afterwards, the rates steadily increased to approximately 4% for both types of resources at the end of the period.