But it is likely to be higher , given the explosion of migration for work after 2001 and the tendency of some migrants to settle permanently in the countries where they live .
For the entire period 1990 -- 2006 estimated population loss tops 1.5 million .
It is likely to be higher , given the explosion of migration for work after 2001 and the tendency of some migrants to settle permanently in the countries where they live .
For the entire period 1990 -- 2006 estimated population loss tops 1.5 million .