What we did actually is use an international cost of living calculator. So it doesn't just convert what you were earning into dollars which will look low, but does a proper comparison. You can even get these on a city basis. So for example the dollar value of earning rands in SA vs San Francisco is around double (that is if you were earning the rand equivalent of $50000 in SA, in San Francisco you need to earn around $100k for the same purchasing power). I'm sure you can do the same for birr if you look properly on the Internet. May help for those questions of "what was your previous salary".
Although bearing in mind most people take a step back at first.
Also you should be listing where the company location is on your resume, right after the name of the company, they shouldn't be having to ask you?