Moreover, intercountry and intertemporal comparisons always involve complex technical problems, which have no full and unequivocal solution.
The statistical systems in many developing economies are weak, and this affects the availability and reliability of the data. Readers are urged to take these limitations into account in interpreting the indicators, particularly when making comparisons across economies. World Tables addresses issues of data reliability partly by omitting questionable estimates but also by flagging methodological issues that can influence analysis.
Country pages for about ten Bank members have been omitted for lack of adequate data; some time series on other country pages are blank or uncertain.
Unless otherwise stated, data are reported for calendar years.