Using percentages with dynamic charts makes it easy to analyze changes as values adjust.
The minimum value for an axis must be a whole number, which can be an issue when using percentages as you may want the scale to go from 0.5 (50%) to 0.9 (90%) for example.
You can do this by plotting the numbers multiplied by 100, and then setting the number format of the axis to display the% sign after the number using the format 0"%".
This means the scale starts at a whole number and the axis labelling is also correct.
If you need more precision, you can also use a format like 0.00"%".
As the axis is scaled by 100 you must also scale the values being plotted. If you are creating a small multiple against a cube the easiest way to do this is to create a custom calculation with the expression
[Measures].[My Measure] * 100
and plot that.
