The pie diagram illustrates produced electricity in units by fuel source like Coal, Oil, Natural Gas, and so on in two countries in 1978 and 1998. The two countries are Germany and Denmark.The main change is measured in Denmark produces 90 units in 1978 while after 20 years it creates 160 units.Similarly, germany starting with 80 units in 1978 and in 1998 it increased to 160 units.
Looking at the details of the Denmark,In 1978 the highest electricity manufacured from coal which are 53 to 122 in 1998. while hydro power and natural gas both are 15 to 34 and 2 . At the end, oil are only 7 for electricity production in 1978 are reduced to 2 after 20 years.
In contracts,The Germanys largest electricity production are coal and natural gas which is 22 in 1978 after 2 decades it has minor decline of 2. Additionaly, The significatly different Germany shows from 1978 to 1998 is nuclear power 11 to 111 where as the hydro power 5 reduced to 3.
Overall, The both countries changed significatly 1978 to 1998 for electricity production. Moreover, Denmark major change is coal while Germany is nuclear power.