Create custom calculated fields called, "5% Percentile", "10% Percentile, "15% Percentile, etc.
Use the following formula for each calculated field:
So for "5% Percentile, your calculation may look like this...
Next, place your "X,Y,Z" dimension on Columns, Measure Names on Rows, and Measure Values on Text on the Marks Card.
Add only the custom Percentile calculations to the Measure Values card.