The TechValidate application can automatically give you the option to aggegrate responses over several surveys, allowing you to build out larger samples sizes over time with identical questions. To enable this feature, Duplicate Project with the link on the right side of the original project or "Add an Existing Question" in the Questionnaire builder when you're creating your survey.
Select desired content type - charts or statistics:
Select All Projects, then click Publish to see the preview of the aggregated statistics:
Preview your asset, title it, and publish normally.