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My few data points being a TA for many years at a top engineering school: about 70% of the cases I reported for violations were domestic students.
If there is 10 out of 100 international students, and they do 30% of 10 cases, then 30% (!!) of international students cheat while only 7% of domestic students cheat - in conclusion, international students do most of the cheating.
Regardless of this statistical thought experiment, I don't know what to do of data like this. It is not really ethical to act on it.
I am sure you are capable to abstract my comment and understand the point.
It is quite natural to explain concepts with made up numbers.