The pie charts clearly compare the resources of electricity over a long periods of twenty years from 1980-2000 between two counties namely, (Australia and France). These electricity production almost doubled, rising from 100 unites to 170 units in Australia, and from 90-180 unites in France.
In 1980, Australia used coal as a main source which produce 50% of electricity respectively, and the remainder was produce from natural gas and hydro power (each producing 20%). By 2000, the production rate from coal was at peak which generate around 75% of the electricity resource and only hydro continued to become another significant source which supply approximately 25%.
In contrast, France used coal as a source that produce 25 units which was matched by natural gas in 1980. The further 40 units were produced largely from oil and nuclear power, with hydro contributing only 5 units. But by 2000 nuclear power which was not used in Australia developed into the main source, producing almost 75% of electricity, at 126 units, while coal and oil together supply only 50 units. Other resources were no longer significant.
Overall, what stand out from the chart is that both countries relied on different source of production: Australia relied on coal, and France on nuclear power.