Google trends still lists Nigeria as having the worldwide highest interest in bitcoin, but that is fading. Here is the Nigerian interest level in bitcoin over the last year.
http://i.imgur.com/SoJKFsg.jpgWell that's obviously not accurate because it goes right up to 100% interest at one point. There's only so much statistics can get right, and this is not one of them. There is at least 1 person in Nigeria that is skeptical of bitcoins.