The pie charts provide information about units of electricity manufacturing by fuel in two countries (Denmark and Germany) during the period spanning from 1978 till 1998.
Overall, it is clear that there are five various figures (Coal, Oil, Natural Gas, Hydro Power and Nuclear Power). It is obvious that the major units by fuel from coal are required in Denmark; however, the quantity of units from Nuclear Power was significantly greater in Germany.
Regarding Denmark, in the first period total production accounted for 90 units; meanwhile, the majority of units accounted for 53 units; however, 20 years later, it considerably increased to 122 units. The proportion of Hydro Power in Denmark was roughly 15 units at the start of the period and it experienced a rise by exactly 19 units in 1998. The number used by natural gas and oil was around 15 and 7 units; nonetheless, they dropped to exactly 2 units for both of them in 1998.
When it comes to Nuclear Power, the number of fuel used for it in 1978 was approximately 11 units; nevertheless, this number significantly rose to 111 units in 1998. The units of coal stayed the same for all over the period.