How this series is built
Energy-weighted average. Not a median of countries.
Official SDG 7.2.1 series from Tracking SDG7 (IEA, IRENA, UNSD, World Bank, WHO), accessed via World Bank WDI (EG.FEC.RNEW.ZS). Includes traditional biomass as well as modern renewables, so the World share can fall while wind and solar grow. Only years with a published World value are shown.