Be careful with those answer boxes, they don't always answer the question you want to know. It seems that coffee is 34% of Ethiopian exports, not their economy
Please don't blindly trust those answer boxes. One example of an answer that looks simple and definitive but was actually way off: https://youtu.be/TbHBHhZOglw?t=58
(Google has become worse for long tail search queries, but interestingly now has an 'answer box' for wide ranging questions like this one.)