When do I see these numbers?

The ChosunIlbo posted a story about cost sharing of education in Korea, as compared to other OECD countries. The last paragraph said something interesting and read like this:

The average number of students per teacher is 26.7 at elementary schools, 20.8 at middle schools and 15.9 at high schools, again much more than the OECD average of 16.2 at elementary schools, 13.3 at middle schools, and 12.6 at high schools.

When do I get these numbers? My smallest class is 35 and the largest is 40. At least I don't have to worry about the classes getting largerer.