Were there any significant data revisions of the component indicators for the 2015 HDI?
The major data revision was made by the United Nations Population Division for demographic indicators, including population size and life expectancy. New data were released by the United Nations Population Division as ‘The 2015 World Population Prospect’ on 29 July 2015.
This revision has had impacts on HDI values and ranking because of revised life expectancy, but also because of the revised population size which is the denominator in Gross national income per capita and in education indicators. The effects were non-uniform across countries - some got life expectancy revised upwards some downwards, the same happened with other indicators.