This world is divided into richer and poorer countries. Highlighted countries are considered rich, as the personal income averages more than US $2,500/year. Anybody making less is part of the rest, the poor. Accordingly, there is a migration from poorer to richer countries. Inconsistent definitions of labor migration, and the untrackable nature of illegal migration has resulted in a scarcity of data on the subject. Arrows shown represent flows of at least 50,000 migrants in a given year between 1986 and 2003 as noted by the International Labor Organization.