This is likely possible, but you'd have to track it within your own helpdesk.
If you're embedding a survey in a solved email notification, Simplesat can track the number of opens, but not how many emails were actually sent.
To get the sent total, you would need to look in your helpdesk for the data. This could be possible in some helpdesks by configuring the trigger that sends the survey to also apply a special tag, such as "survey_sent".
Then, you can compare the number of surveyed tickets to the unsurveyed tickets and the open rate that we offer from within Simplesat.