Millions of people leave their home countries each year, fleeing conflict or violence, seeking better work opportunities, or simply to be closer to family. What proportion of those people are women? In many of the countries that are home to the largest migrant populations, a majority, in fact. While many women leave home for the same reasons as men (social instability or economic opportunity) gender-based violence or persecution often play a special role in women's decisions to pick up stakes and move. Here's a look at the gender breakdown of some of the world's largest migrant populations.