I found the answer in the documentation for the Visualisation API in the Data Policy section:
*All code and data are processed and rendered in the browser. No data is sent to any server.* -- You received this message because you are subscribed to the Google Groups "Google Visualization API" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-visualization-api?hl=en.
