Dear Janimal -
The graph isn't meant to be all inclusive. It's meant to give a representation of a few in each category. A graph with every single country on it would be quite hard to read.
I don't think it's about simple dollar figures because then it would be weighted towards all the high-income countries and leave out all low-income countries. It's trying to examine how pervasive corruption is in all levels of society, which is different.
Lisa Shea, Owner