The United Nations Population Fund says that "[while the North has experienced a higher absolute increase in the migrant stock since 2000 (32 million) compared to the South (25 million), the South recorded a higher growth rate.[8] Between 2000 and 2013 the average annual rate of change of the migrant population in the developing regions (2.3%) slightly exceeded that of the developed regions (2.1%).[8]
Shirika la Umoja wa Mataifa la Idadi ya Watu linasema kwamba "[wakati Kaskazini imepata ongezeko la juu kabisa la hifadhi ya wahamiaji tangu 2000 (milioni 32) ikilinganishwa na Kusini (milioni 25), Kusini ilirekodi kiwango cha juu zaidi cha ukuaji.[8] Kati ya 2000 na 2013 wastani wa kiwango cha kila mwaka cha mabadiliko ya idadi ya wahamiaji katika mikoa inayoendelea (2.3%) ilizidi kidogo ile ya mikoa iliyoendelea (2.1%).[8]