The world has never been as dynamic as today with its population crossing borders of
countries and regions in every corner of the earth. According to the Migration and
Remittances Factbook 2011 (World Bank, 2011a), more than 215 million people (3.2%
of the world population) lived outside their countries of birth in 2010. While the United
States is the top receiving country with 20% of the world’s immigrants, Mexico is the
top sending country with 11.9 million of outflow in 2010. In Qatar, 86.5% of the
population was composed of immigrants from other countries; whereas in West Bank
and Gaza, 68% of the country’s population had emigrated.