My google spreadsheet now also has the ratio for ratings given versus received. I will repeat what I said in the spreadsheet since it is very relevant:

E1:

Given To Received Ratio of ratings, Note: instead of dividing by 0, I either answer with 1 if no rating were given or max value if at least 1 was given. Also note that given ratings are divided by 8 while received is divided by the amount of categories. Warning not 1 to 1 total ratio, see sheet "Stats".

Link: https://docs.google.com/spreadsheets/d/1HWYo-es4weXRFnUBhKAUHX9rCodGiczvyIsWRkx9eoo/edit#gid=0

Note: The ratio is rounded to the 3rd decimal place.