Only 12.5% of the population scores in the levels 4 or 5 (they had to group them together because there were so few is my guess). This is a disgrace. There's no reason why every adult should not be able to read proficiently. We are talking about reading, not some obscure skill.
I wonder what these figures would be in Cuba. From what I remember reading, they were much higher because of widespread literacy campaigns.
Edit: Found the source of this figures (https://www.oecd-ilibrary.org/education/oecd-skills-outlook-...) which has data from more contries in the OECD. Japan scores the highest, followed by Finland.