Nyororin, I thought that same thing too-- the number of people who actually ate it would be really slim... but I expected that some people did eat it.
I'll post the link I posted before one more time:
@nifty
I wish it had more information about where their data came from, but according to those graphs, it says 32%! I don't believe that's an accurate depiction of what reality is, but it makes me wonder quite a bit on this whole situation. I'm gonna go ahead and talk to my students to feel it out haha. I would've been surprised at 10%, but 32% seems high to me. At any rate, I'll try to look for more data regarding this habit. It's almost as if it could be a guilty pleasure or something. I suspect japanese people don't put as much soy sauce on rice as americans, but they probably sneak some on sometimes-- at least according to this survey. Maybe the "what japan thinks" blog will have some information on this. There must be some kind of bias or data collection mistake in the survey I found.