I also just read his post where he calculated it to around 12.5% and let's hope he can again do the quick SQL Queries for this question of yours.
It is great for us to know out of the remaining 87.49% how much is actively being used per every 24 hours.I am glad i have found this info discussed as a newbie!!!
Let us hope out of the 87% we have 50 being used...it would be great!