Were there any significant data revisions of the component indicators for the 2018 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 World Population Prospect, 2019 Revision’ on 19 June 2019.
This revision has had impacts not only 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 and some downwards. The same happened with other indicators.