As of 2015, about 13% of the UK’s resident population was foreign-born, comparable to the roughly 14% foreign-born share in the United States.

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Immigration to the United Kingdom has been one of the most important issues driving the debate over whether or not the UK should remain a member of the European Union.

Britain’s exit from the EU, or “Brexit,” will be decided in a June 23 referendum, with some seeing an exit as a way to slow immigration into the UK.

Here are five facts about migration into and out of the UK: The UK has the fifth-largest immigrant population in the world, at 8.5 million.

Between 19, the UK’s immigrant population more than doubled, from 3.7 million.

By contrast, Luxembourg, at 89%, has the highest share of its immigrant population that is from other EU countries.

The UK’s neighbor Ireland also has a higher share (74%) of EU immigrants, as does Germany (44%), the EU country with the highest number of immigrants.

Brexit debates have mostly focused on EU immigrants living in the UK. Among the 10 countries with the highest number of emigrants, the UK is the only Western European country to appear on the list.

In 2015, about 4.9 million people born in the UK lived in other countries, the 10th-largest emigrant population in the world. Other top origin countries of emigrants include India (15.6 million), Mexico (12.3 million) and Russia (10.6 million).

Overall, about 8% of those born in the UK live outside its borders. Among the EU nations with the largest populations, about half of France’s (49%) and Germany’s (45%) emigrant populations live in other EU countries.