[ken]

I find this list fascinating, because it seems counterintuitive. I expected to find generally lower illiteracy in countries with simpler/fewer languages, but Romance languages (Italian, Spanish) top the list, while countries with multiple official languages (Switzerland, Canada) are in the middle, and at the bottom are countries with multiple languages and which are generally thought to be difficult to learn (Danish, Finnish). That seems almost backwards.

What I get from this is that when it comes to success in language learning, technical difficulty is mere rounding error compared to other factors.