Bit of a mis-nomer here for me. When I think "oil dependent" I guess I think of it as a dependency on oil imports. Not necessarily countries whose economy hinges on oil exports. I was going to start guessing countries who import a ton of oil, but then saw the picture and knew I was wrong...then I read the instructions. Maybe I should read the instructions first.
I thought the same thing when I first read the title. I thought it would be countries who are most dependent on other countries for their oil. Good thing I read the directions for once.
Iraq, Libya, South Sudan. All areas with recent civil war, and all at the top of the list. I assume that oil is one of the easier things to keep exporting during periods of unrest.
The UAE exports a lot of gold, diamonds, minerals and other raw and scrap materials, some electronics, some agricultural products, and a lot of other stuff. Their economy is a lot more diverse than other Gulf countries. Bahrain doesn't export much of anything - some aluminum and textiles and a few other products. Their total exports are a small fraction of the UAE's, but their oil reserves have been pretty well depleted at this point. That's the main reason Bahrain doesn't show up.
Some of these countries are somewhat concerning, especially Nigeria. While it isn't the poorest country on this list, it's by far the biggest population-wise, and still growing. While I really want fossil fuels to be phased out as soon as possible, it's also probably important to have a conversation about how to do so in a way that gives many of these countries enough time to transition away from the oil industry and diversify.