Wars are hell. There is no way to accurately give a censu. There is also omission and falsification of data.
Someone recently put together a guess about the value of the Bangladeshi garment industry. They claimed 31.8$ billion a year in exports. This was a major lie but people have little choices/
Another factor is the current conflict in the Rohingya populated state. There have been 3 widely separate guesses about how many political refugees their are.
Original: Pay Attenion to Numbers