Multiple resources are available. The report is published by the United Nations Population Division, Department of Economic and Social Affairs.
International migration report 2015: Highlights (36 pages; PDF)
This publication contains the latest quinquennial estimates of the international migrant stock for 232 countries or areas. The annex to the Highlights provides data for 2000 and 2015 on the estimated number of international migrants, the percentage of migrants in total population, the percentage of female migrants, and the median age.
International migration stock: The 2015 revision
The dataset presents estimates of international migrants by age, sex and origin. Maps, graphs, and infographics are available.
International migration wallchart 2015
This wallchart presents the 2015 the latest estimates of international migrant stock for 232 countries or areas.
International migration flows to and from selected countries: The 2015 revision
New time series data on the flows of international migrants from 1980 to 2013 covering 45 countries. Downloadable (.xlsx)
Trends in international migration, 2015
Population Facts No. 2015/4, December 2015
Source Page (via UN)