With SAS Visual Analytics 8.5, you can use the _Full_ parameter interval to calculate over multiple years rather than year over year.
Hope this helps,
Jaime
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Examples are here: https://documentation.sas.com/?cdcId=pgmsascdc&cdcVersion=9.4_3.4&docsetId=etsug&docsetTarget=etsug_expand_examples04.htm&locale=en
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