Global birthright indicators have been calculated for 177 countries for 2016, including the 42 countries calculated in the Citizenship Law Indicators. These are based on citizenship laws on 1 January 2016; they include all indicators for ius sanguinis and for ius soli at birth, but exclude ius soli after birth, i.e. acquisition of citizenship based on birth in the territory at the age of majority or after some time of residence. A score of 0 means that a mode of birthright acquisition does not exist; a score of 1 means that there are no restrictions for this mode of birthright acquisition. Scores between 0 and 1 represent degrees of restrictions or conditions for acquiring citizenship by birth. Details of coding methodology are provided in the explanatory paper.