The given pie charts provide information about the units of electricity produced by fuel source in Denmark and Germany between 1978 and 1998.
Overall, it can be seen that some visible comparatively ups and downs occurred between electricity produced by fuel source. The highest proportion was for coal, while the lowest proportion was for oil and natural gas.
According to the pie chart, in 1978, total electricity production increased from 90 units to 160 units during the year of 1998. Moreover, the amount oy coal produced in Denmark climbed by 69 units, from 53 units to 122 units between 1978 and 1998. Conversely, in Denmark, oil and natural gas were 7 units and 15 units, and it dramatically declined mere 2 units both fuel between 1978 and 1998.
In terms of the remaining fuel sources, in Germany, natural gas was 22 units in 1978, which decreased to 6 units in 1998. However, there was an increase of 100 units in the amount of nuclear power production, from 11 units to 111 units over 20 years.
