Line Plot - Options
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Graph > Line Plot > OK > Plot Options

Use to standardize Y values within X categories.

Dialog box items

Show Y as Percent: Check to use a percent scale on the y-axis.

Take Percent

Across all x-categories: Choose to display the percent within all data.

Within each x-category: Choose to display the percent within variables. Choose this option to standardize within categories and accentuate differences.