Yemen economy facing recession

Yemen does not have a market for shares and it is one of the least developing countries. Yemen also seems not to be affected by the current economic crises as if it is in Mars planet not on earth or maybe its economy is isolated or closed from the rest of the world. Back in the 1930s Yemen was really isolated from the world, that explained why it did not affected by the world economic recession at that time, but now why, Yemen economy is opened, it depends on the world for so widely, its main exports are oil and fish, and it almost import every thing from outside.