Thomas Gaskin and his colleagues at the London School of Economics have just published something remarkable: the first complete annual record of human migration flows between every country on Earth for the past three decades. The numbers they've uncovered tell a story that contradicts what we thought we knew. Global migration has nearly tripled since 2000, climbing from roughly 13 million people annually to around 35 million in 2023—and this surge has outpaced population growth itself, meaning that people are increasingly mobile, not just more numerous.
This matters because migration is one of the most consequential human movements of our time, yet we've been measuring it in the dark. Until now, policymakers and researchers relied on snapshots taken only once every five or ten years by the United Nations and World Bank. Those frozen moments—often released years after the fact—could miss entire crises. Wars, recessions, pandemics, climate shocks: they could vanish from the official count, leaving governments unable to anticipate needs or understand patterns as they unfolded.
Gaskin and his team at LSE, IIASA, and the University of Hong Kong used deep learning to weave together official statistics, census records, and economic data into something new: a year-by-year picture of where people actually moved. The results reveal migration landscapes that traditional data simply couldn't capture. The Middle East now stands as the world's largest destination for migrants, drawing workers chiefly from South Asia. Since 2010 alone, roughly 19 million people from India, Pakistan, and Bangladesh have migrated to Saudi Arabia, Qatar, Bahrain, and the UAE—averaging 1.35 million per year. Bangladesh to Saudi Arabia alone accounts for about 300,000 migrants annually in recent years, a flow so substantial it dwarfs many entire regions' migration stories.
But the dataset's greatest gift may be its clarity on the Global South, where migration data has historically been sparse and fragmented. In the mid-2010s, the annual records captured events that five-year snapshots would have blurred or missed entirely. When civil war erupted in South Sudan from 2013 onward, the data shows a large-scale exodus into neighboring Ethiopia. When Boko Haram's insurgency in Nigeria escalated in 2014—the same year the group abducted nearly 300 schoolgirls—an estimated 79,000 Nigerians fled to neighboring countries, with 45,000 crossing into Niger between 2013 and 2014. These aren't footnotes; they're human dramas now rendered visible in precise annual figures.
Interestingly, the data also challenges a common assumption. Previous methods suggested that global migration flows had remained relatively stable, but that was partly an illusion created by those coarse five-year intervals. The annual data reveals instead that migration rates have risen consistently since 2000—driven not by sudden shocks, but by long-term demographic shifts and economic development. Only twice did the upward trajectory pause: during the 2008–09 financial crisis and the COVID-19 pandemic.
Europe remains the region with the highest volume of intraregional movement, though sub-Saharan Africa briefly surpassed it in the early 1990s during the Rwandan civil war. For the first time, researchers can track not just how many people move, but precisely when, where, and—increasingly—why. That granularity transforms migration from a distant statistic into actionable knowledge for policymakers navigating an interconnected world.