* Country: School leaving ages and dropout rates differ dramatically across the globe. Developed nations generally have lower dropout rates than developing nations.
* Definition of "leaving school": This can include students who drop out completely, those who are expelled, and those who leave to pursue alternative education paths (like apprenticeships). The methodology used to collect the data heavily influences the outcome.
* Data Collection Methods: The accuracy of the data depends on the reliability of the reporting systems in each country or region.
Therefore, while you can find statistics for specific countries or regions, a global percentage would be misleading and inaccurate. To get a meaningful answer, you need to specify the country or region of interest.