Recently my purchases have been skewing back towards print even when e is available, but overall I would estimate 2-5 on average is a good answer for now.
But again as in the "how many overall thread", details about what counts as an e-book purchase - do Amazon shorts count, do Asimov's subscriptions count as 1 or 10 or none?, may skew the answer considerably since a large part of my e-reading consists of short stories - in print too, I buy quite a few anthologies, though I buy many more novels true, and very little non-fiction - the library is good for that since it gets dated easily
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