This must be understand as a very partial (incomplete data point). It has been calculated using the available data. However, we do not currently have a comprehensive way to calculate this measure as so few partners delineate how many volunteers are return vs. new. - AM
The following partners report data that is aggregated here:
Note: there are many more volunteers, both return and new; however, the majority of our partners do not currently delineate return vs. new in their reports of volunteer hours.