Subjects in Task 1

Americans rose steadily, while Indonesians fell dramatically.
Americans rising and Indonesians falling

Americans rising and Indonesians falling

With a sentence like the one above you are unlikely to communicate anything meaningful about a graph, table or chart. If there was a rise or a fall, then you need to state precisely what it was that rose and what it was that fell. What is the subject?
chart: divorce rate
The divorce rate in America rose steadily, while the divorce rate in Indonesia fell dramatically.

Here there are 2 subjects:

  1. the divorce rate in America
  2. the divorce rate in Indonesia

Some of you will complain about the repetition in this sentence ('the divorce rate'). However, it's better to repeat words and phrases and communicate something meaningful than to avoid repetition and communicate nothing.

Actually in this example repetition can be avoided:

The divorce rate in America rose steadily, while that in Indonesia fell dramatically.
fall down Indonesians

* Many thanks to Diro, Nando and Ari for the 'falling Indonesians' photo - You guys rock! :)