3X Global mobility in the 19th century versus the 20th century

From When was the great age of migration? by Tyler Cowen. I posted a while ago about intra-colonial migration (example Indians to Burma, all within the British Empire). This is interesting for the world context of such movements.

Between 1815 and 1914 at least 82 million people moved voluntarily from one country to another, at a yearly rate of 660 migrants per million of the world population. The comparable rate between 1945 and 1980, for example, was only 215 per million.