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LONDON — There were 244 million international migrants recorded in 2015, and over 60% of global migration consists of people moving to neighbouring countries or countries in the same region, according to the World Economic Forum (WEF).

Asia-to-Asia was the largest regional migration corridor in 2015, with 59 million migrants, followed by the Europe-to-Europe corridor, which had 40 million migrants.

According to the WEF, migrants contributed between $6.4 trillion and $6.9 trillion, or 9.4%, of the world’s gross domestic product in 2015.

In 2016, the National Academies of Sciences, Engineering and Medicine found that although first generation immigrants are more costly to governments that the native born population, second generation adults are among the population’s strongest economic and fiscal contributors.

Keep scrolling for some of the world’s busiest migration routes:

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The Mediterranean

The Central Mediterranean route was under intense pressure in 2015, although pressure eased slightly from 2014 as more Syrians moved to use the Eastern Mediterranean route and smugglers faced a shortage of boats.

Between January and November 2017, there were an estimated 116,573 illegal border crossings via this route.

Most migrants gather in Libya before making the rest of the journey by sea — typically in poorly equipped or old boats that are prone to capsizing.

There were also an estimated 19,808 illegal border crossings via the Western Mediterranean route between January and November 2017.

Source: Frontex

Eastern Mediterranean route

In 2015, 17 times the number of migrants arrived in the EU via the Eastern Mediterranean route than had done in 2014. The majority arrived on Greek islands, mainly Lesbos.

Between January and November 2017, there were an estimated 37,961 illegal border crossings via this route.

Most of the migrants on this route in 2015 originated from Syria, followed by Afghanistan and Somalia.

Source: Frontex

Central America

Migrants in Latin America generally move from rural to urban areas. The region has experienced considerable internal displacement over the last century, particularly Colombia at the moment.

Source: World Economic Forum

See the rest of the story at Business Insider