They are some common patterns that can be used to describe a line graph. It's better for you to remember how to use the patterns in these samples.
Exports of the vegetables fell dramatically throughout the first half of the year. They recovered in July, but started to fall again towards the end of the year.
Exports of the rattan furniture fluctuated throughout the year, but the general trend was downwards.
Imports of the cars increased until late July, leveled off, then rose very slightly at the end of the year.