If all of the adults on the planet could migrate to the countries where they wanted to live, the world would be a very different place. Developed nations would be overwhelmed and many developing countries would be left relatively empty.

Gallup has gathered data over the past three years and come up with a Potential Net Migration Index (PNMI) that shows just how drastic this change could be.

Listed below are some of the more interesting findings.

Rank by Percent Change

Country, Percentage Change, Population Change

1. Singapore - 260% (+13 million) 

2. Saudi Arabia -180% (+48 million)

4. Canada - 170% (+57 million) [Canada would rank 14th in world population]

9. France - 70% (+45 million)

10. United Kingdom - 65% (+40 million)

12. United States - 60% (+186 million) [Greatest Population Gain]

15. Botswana - 55% (+1 million)

28. Germany - 15% (+12 million)

32. Japan - 5% (+6 million)

36. Thailand - 0% (no change)  [Isreal, South Korea, and Tajikstan also have no change]

41. China - -5% (-65 million)

48. India - -5% (-55 million)

172. Nigeria - -50% (-80 million) [Greatest Population Loss]

178. Democratic Republic of Congo - -60% (-40 million)

Source: Gallup World Poll