The pie charts compare the amount of electricity produced by five different methods (coal, oil, natural gas, hydro power, and nuclear power) in two countries Denmark and Germany over two decades from 1978 to 1998.
Overall, in Denmark coal made up the largest share in electricity production during the period, while nuclear power did not exist. In contrast, at the beginning, oil, coal, and natural gas accounted for the largest part of energy in Germany. However, nuclear power experienced a significant increase in electricity production and accounted for the largest share at the end.
In 1978, coal produced more than a half of electricity in Denmark (53 units), while oil produced a little (7 units). Hydro power and Natural gas constituted the same amount (15 units). In Germany, coal, and natural gas produced a similar amount of energy (22 units), followed by oil (20 units), nuclear power shared 11 units, hydro power remained the lowest part (5 units).
After two decades, electricity production by nuclear power increased significantly and produced more than a half of energy in Germany, while in Denmark nuclear power plants did not appear. Moreover, in Denmark energy production by coal reached 122 units, it made up more than two thirds in total.