Presumably, that same study would tell us which countries from Europe, or Asia, or South America, or Central America, or Russia.  "And, how many of them went back to their countries or did they overstay and blend into the population?"  The two most prominent deportees from Hawaii, who didn't go back to their countries, and overstayed and blended into the population, are from Mexico (the Big Island farmer) and the UK (the Big Island juggler).