User blog comment:ItsukoChan/Hair Curls/@comment-2157381-20100926202056

This observation makes sense to me. I also noticed that Austria's hair changes regularly, being Mariazell and all. And in recent time drawings his ahoge is quite perky, similar to present time America's. You are so awesome for thinking of this :D

I only have general information about the other countries, though, so I cannot compare them to anything...