On all three (literacy) scales, only Sweden had higher percentages of their adults at these levels

From International Adult Literacy Survey from Institute of Education Sciences.

* Results from the International Adult Literacy Survey (IALS), which measured proficienty on 3 scales (prose literacy, document literacy, and quantitiative literacy), showed:

Between 19 and 23 percent U.S. adults performed at levels 4 and 5, the highest levels, in the three literacy scales. On all three scales, only Sweden had higher percentages of their adults at these levels.

[snip]

* Between 21 and 24 percent of U.S. adults performed at Level 1, the lowest level, the three literacy scales.

So our best are right at the top, our worst are right at the bottom.