source
The above chart, from Gallup, shows where people across the globe would like to move. The next chart, shows where the largest numbers would like to move from.
As shifts continue to occur in global economic conditions, job opportunities, living costs, and climate change, I'd expect these statistics to continue to change. It is important to note that the migration sample is for desired, not intended migration.
--Kalpa
Source: [Migration Could Triple Populations in Some Wealthy Nations]