I have to admit I raised an eyebrow at Greece being near the top of the list. That's going against stereotype hard.
Stereotypes are just stupid and lazy thinking.
How can two people with exactly the same output (say two doctors working a shift with similar number of patience) lead one to be 20 times more productive because one bills $400 per hour and the other makes that number in a week (such as in say Turkey).
That's a 40x difference in productivity.