I thought Mandarin would have been much higher! Even considering only half (less, I assume?) the population would know the 4500 characters to be consider 'literate', that's still more speakers than the population of most countries with English as a first language...
(So, who's at the bottom... /me googles...).
jaminJay
"Sprinkle a little on your toast every morning,
You'll always be seen at your post, never yawning."