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.
Imports of the garments fluctuated, especially in the first three months of the year, but the general trend was upwards.
The PC sales were stable until July, then entered a period of fluctuation which lasted for the rest of the year.
Production of the fruit , however, remained reasonably stable throughout the year.