According to a study by William Russell, South Korea has seen the largest increase in immigrants globally, with numbers growing from 43,000 in 1990 to over 1.7 million in 2020, a 3,896% increase. Bulgaria leads in Europe, with immigrants rising from 21,000 in 1990 to 184,000 in 2020 (757%). Spain also experienced significant growth, from 821,000 immigrants in 1990 to 6.8 million in 2020 (732%).
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