I find that 90% little hard to buy. Based on my experience, I would guess they all (Mac/Linux/Windows) have roughly 1/3rd share, the trend being rising for Mac

I find that 90% little hard to buy. Based on my experience, I would guess they all (Mac/Linux/Windows) have roughly 1/3rd share, the trend being rising for Mac and downward for Windows. (Okay, my view may be Western centric.)