[Plugin: Statpress] Decreasing Table Size?

I had set my Statpress options to automatically delete visitors after 3 months.
My Table Size kept growing and growing everyday, it’s at 94mb now, when statpress deletes old visitors after 3 months doesn’t it also cut down in size??
Just today I changed it to delete visitors after 1 month, but that made no difference in size.. What can I do? I don’t want it to go higher than 70mb and it’s already at 94mb
I have already tried asking on the statpress forum but received no answer for over a week now