题目：The pie charts below show units of electricity production by fuel source in Australia and France in 1980 and 2000.
The information given by the pie charts is about how electricity is produced by different sources in two countries – Australia and France in two separate years (1980 and 2000).
In Australia, the units of electricity are produced by four different sources. In 1980, coal was the most popular source which produced 50 units of electricity. It is interesting to note that the units of electricity generated by hydro power equaled that by natural gas (20 units). In addition, only 10 units of electricity sourced from oil. Two decades later, the total production had risen to 170 units. Specifically, the data for coal increased sharply to 130 units, and that for hydro power witnessed a similar trend. In contrast, both natural gas and oil rapidly dropped to only 2 units respectively.
In terms of France, in the year of 1980, its electricity was generated by five sources. Natural gas and coal were the most important ones which produced 50 units altogether, representing more than 50% of the total 90 units. It was followed by oil and nuclear power which generated 20 units and 15 units respectively. Only 5 units was made by hydro power. After 20 years, total production soared to 180 units, among which nuclear power amazingly rocketed to 126 units, while coal remained constant. Natural gas and hydro power alike dropped to only 2 units.
In conclusion, over the two decades, the approaches of electricity generation had undergone great changes both in France and in Australia. It is noticeable that coal and hydro power were relatively important in the two countries.