Increase in recent arrivals from Northern Triangle and Asia, decrease from Mexico Population of arrivals in previous five years, in thousands
The large drop in new arrivals is almost entirely due to a drop in the number of Mexican unauthorized immigrants coming to the U.S. In 2017, Mexicans accounted for 20% of unauthorized immigrants who came to the U.S. in the previous five years, compared with 52% in 2007. This represents a decrease in the average annual inflow of Mexican unauthorized immigrants, from about 375,000 per year in 2002-2007 to about 90,000 per year for 2012-2017. For other regions of birth, the average annual inflows did not change significantly, but the shares of the total increased due to declining Mexican arrivals.
Increase in recent arrivals from Northern Triangle and  | Asia, decrease from Mexico  | Population of arrivals in previous five years, in thousands  | Birth country  | 2017  | Share  | 2007  | Share  | Mexico  | 475  | 20%  | 2, 050  | 52%  | Northern Triangle  | 400  | 17  | 425  | 11  | Asia  | 525  | 23  | 525  | 13  | 925  | 925  | Other countries  | 40  | 24  | Total 2,350  | 3,950  | Note: Northern Triangle consists of El Salvador, Guatemala and Honduras. Asia consists of  | South and East Asia. All numbers are rounded.  | Source: Pew Research Center estimates based on augmented U.S. Census Bureau data.  | PEW RESEARCH CENTER 