There's a bunch of legal free ebooks I get. So I say 0 average, I stretch the months I buy ebooks. Usually go to allromanceebooks, harlequin, fictionwise, elloracave. And when I do buy on those days, I tend to buy 8-15 ebooks.
And just go thru them before I buy another batch. I buy mostly romance fiction ebooks.
But I do still buy paperbacks.
Even if I've read them already in ebooks and I love to re-read them, I collect and buy the physical books.