Faceman's question does raise an issue about the diagram. The appearance, at least at a glance, is that nearly every Mexican and every Peruvian has left the building. But that's not right.
The width is net immigration. So the graph really shows lots of people leaving and almost no one is emigrating to Mexico rather than that some extremely high per percent of Mexico's population have left their country.
Edited by NoNukes, : No reason given.
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