I typically read 30 to 40 books a year, sometimes as many as 50. I only read on my phone and on my various ereaders. I haven't read a paper book in so long I don't remember how long it's been. Well over 20 years. Before that I read paperbacks almost exclusively.
I currently have 10 ereaders and a phone that I read on. The majority is on my Kindles although I read a bit on my Kobos and a bit more on my Nooks. So I have no idea how to divide any of that up by reader.
Actually I'm not sure why anyone cares, other than just as a way to generate conversation, although I was motivated to reply to this thread so I guess I care. I'm not at all sure why.
Barry