Taking in refugees often puts enormous economic and societal pressures on host countries. That's especially true in places where many of their own citizens already have limited access to food, shelter and support networks of family and friends. Several of the world's top 10 countries hosting refugees show exactly this: a large share of their populations are in the "high vulnerability" category of Gallup's Basic Needs Index. That puts refugees in these countries in the tough spot of potentially competing for resources from governments already struggling to meet the needs of their own people. Here's a look at the underlying economic and social vulnerability of the population in the countries that host the most refugees.