These documents, sometimes referred to as Private Letter Rulings, are taken from the IRS Written Determinations page; the IRS also publishes a fuller explanation of what they are and what they mean. The collection is updated (at our end) daily.
Ethiopia's population was estimated at 51.7 million in 1990. According to the nation's only census, conducted in 1984, Ethiopia's population was about 42 million. But the census was far from comprehensive.
Sudan is often referred to as North Sudan as South Sudan seceded in 2011 with the consent of Sudan. The last official census recording the population of Sudan included the populations of Eastern, Western and Northern Sudan in 2008 and recorded over 30 million citizens, which puts present estimates of the population of Sudan post-secession at 41.51 million.