4. Restrictions in the 25 most populous countries
CORRECTION (Dec. 19, 2025): Some of the text in Chapter 4 has been corrected with updated SHI figures for 2019. Germany is now described as experiencing a “modest decrease,” rather than a “large decline,” in its SHI score between 2019 and 2020. Refer to the errata page for details. More than 5 billion people – almost three-quarters of […]