What does "Non-migrants (international)" mean in the MGCTRY2 variable for Mexico 2010?

I am looking at foreign-born residing in MX in 2010. When I get the data for the variable “Country of residence 5 years ago” I get values for “Non-migrants (international)”. Can anyone explain what this means? Who are these people? COnsidering that the sample does not include popualtion living abroad.

MGCTRY2 gives the country of residents 5 years ago for international migrants, however the question universe is not limited to international migrants. The “Non-migrants (international)” code identifies people who are not international migrants since they are still considered a valid part of the question universe.

I hope this helps.