I also noticed this:
(UK editions except for The Wheel of Osheim)
Given that I was working a day job and caring for a disabled child for that period I'm quite proud of that!
Of course I only have to turn my gaze in Brandon Sanderson's direction to see a yearly word count that puts mine to shame. And if I had Martin's income from A Dance With Dragons off the book I had published in the same year then who's to say I wouldn't have spent more time enjoying the money than writing the next five books!
Anyway - just a fun observation. I could probably fit the six books into the gap between Patrick Rothfuss' The Wise Man's Fear and Doors of Stone too. However, as a big fan of both A Song of Ice and Fire, and The Kingkiller Chronicle, I would rather have the next book in the series take its time and live up to expectation. The disappointment of something rushed out would undermine any joy in seeing the books appear.