I went back and revisited this graph from my previous post, so that it now shows counts of fiction (purple) and non-fiction (pink). I think there might be some non-fiction missing at the start, and certainly I have not included anything I read for academic purposes, but nonetheless one can see how during my Ph.D. (1996–2000) I felt non-fiction to be a chore, and avoided it; it was only afterwards that I started seriously reading non-fiction.
It's also clear how the proportion of non-fiction in my reading has got much higher in recent years (with the exception of the year before last, which I spent re-reading a whole load of books I'd been intending to reread for years, partly to justify having brought them all from the UK).
I did consider breaking the graph down further into, for example, non-fiction read for entertainment for edification, but the boundaries between them are difficult to determine, so I did not in the end.( View graph )