1) In the number of views is more than the number of unique viewers, how can I tell which viewers watched part of the video more than once? 

2) If a  unique viewer watched the video all the way through once and also watched parts of the video again,  which % is reported? 

I like to give bonus credit for a student completing a video, but I am concerned that someone's low percentage could be from reviewing part of the video a second time.  Help please.

Chery Lanier, Spanish Instructor