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We may not be living in the age of mass migration, but we are surely living in an age of mass migration. From 1965 through 2005 a fairly constant 2.2% of the world population have been migrants. However, this has involved an increasing rate of change to keep pace with the growing world population: the stock of migrants grew at 1.2% from 1965-1975; 2.2% from 1975-1985; and 2.6% from 1985-1990. More importantly, for the purposes of this paper, relative to regional population, the share of migrants in the US and Canada rose from 6% in 1965 to 8.6% in 1990 and 13% in 2005; while the share in Western Europe rose 3.6% to 6.1% and then 12% over the same period. This period has also seen a substantial shift toward developing countries as source countries for this migration: in the United States this share rose from 42% in 1960-1964 to over 80% in the 1980s through 2005; in Canada this share rose from 12% to over 80%; while this share in Australia rose from 7% to over 90%. In the 1990s, Germany and Austria experienced very large flows from Eastern Europe as well.