It's diffucult to tell. Can it ever reach 100% in any country given that some people always never learn to read and write due to limitations of their own?
I think that it is very close to reaching the highest possible percentage. Probably the only ones that are still illiterate are a small part of the very old generation. Often people from the lowest social classes.
But for that group of people the mentioned literacy programs (often during summer) have been initiated and they have for years worked to eradicate illiteracy. Like the news I posted show.