With just days left in 2015, the Geneva-based intergovernmental organization said the million mark was crossed Monday, marking more than a four-fold increase from last year.

IOM said more than 820,000 crossed into Greece from Turkey, including more than 455,000 from Syria and over 186,000 from Afghanistan. Nearly 3,700 others died trying to cross the Mediterranean.

The 162-country intergovernmental agency said the arrival of more than 4,100 people into Greece on Monday put this year’s total over 1 million. The figure includes more than 34,000 arrivals by land from Turkey into neighboring Greece and Bulgaria, or only about 3.5 percent of the total this year.