The census also only considers those in the country at the time of survey. How many migrant workers are outside the country that are not included in the census count? Excellent point. Which may explain the discrepancy between the Census and PRB estimates. "May" because I've no idea what t...

It's not surprising that the PRB estimates differ from the Census results. PRB uses its own population projection models that draw on a wide variety of data, including the Census, Demographic and Health Surveys, vital registration systems, UN Population Division projections, etc., and although the D...