Someone does a poll every once and a while. Here are two:
http://news.ycombinator.com/item?id=946249 (858 days ago)
http://news.ycombinator.com/item?id=1675197 (562 days ago)
http://news.ycombinator.com/item?id=946249 (858 days ago)
http://news.ycombinator.com/item?id=1675197 (562 days ago)
Since HN has grown quite a bit in the last few years, I'd be interested to see if we've drifted closer to the 'norm' or if we're still dominantly NT Rationals.