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The only solution I have found for this involves looping through the array of votes that is stored, iirc, against comments - but i would need to look through my code and I am about to go to bed here ;)
If you are able to look at the database of the blockchain, you should be able to find an array that contains vote data and can figure it out from there. I'll look tomorrow if you still need more help.

All I can find is RShares and a time. I'll keep looking. Thanks! All I could think of was accessing historical reward pool data and comparing to that, but it would be less efficient if there were some other way.