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How to do it…

Open the Awareness by Age chart.
Hover over the Number of records green pill in the Marks card, and when the small white downward arrow appears, click on it.
In the menu, choose Format...

In the Pane tab, under the section Default, go to the Numbers drop-down menu.
Choose Percentage and set the number of Decimal places to 0:

In the Pane tab, under the Default section, go to Font.
Increase the size of the font from 9 to 12:

Choose the white color.
In the Marks card, click on Color and select the Edit Colors button.

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