United Nation, Dec. 6 -- A new study launched by the International Labour Organisation (ILO) reveals that the number of migrant workers has jumped by millions, leaving some countries without "the most productive part of their workforce."

According to the second edition of ILO's Global Estimates on International Migrant Workers, approximately 164 million people left home in search of work between 2013 and 2017, a nine per cent increase since 2013, when that number stood at 150 million.

Breaking down the figures, 96 million are men, a rise of 2 per cent, while 68 million are women, a fall of 2 per cent compared to 2013.

"While growing numbers of women have been migrating autonomously in search of employment in the past two decades, the di...