Task 1 饼图

The pie charts show the proportion of the energy produced from different sources in a country between 1985 and 2003.

Summarise the information by selecting and reporting the main features and make comparisons where relevant.

分析：

动态饼图，主要突出不同构成部分的比例变化，但与此同时也要去分析同部分的排序变化。最后要注意表示比例的一些常见用法。