"Since the beginning of 2016, IOM estimates that 45,361 migrants and refugees have arrived in Greece by sea. This is roughly 31 times as many as the 1,472 recorded by the Greek Coast Guard for the whole of January 2015," IOM said.
According to the statement, some 90 percent of the arrivals originate from Syria, Iraq and Afghanistan, the three nationalities that have automatic permission to cross into Macedonia.
Europe has been beset by a massive refugee crisis, with hundreds of thousands of undocumented migrants fleeing their home countries to escape violence and poverty. Many of them take the West Balkan route, which crosses Greece, using the county as an entry-point to the bloc from which to travel to wealthier EU states where they intend to apply for asylum.