IEA (2023), Share of road transport energy covered by fuel economy and/or vehicle efficiency standards in 2000, 2010 and 2022, IEA, Paris https://www.iea.org/data-and-statistics/charts/share-of-road-transport-energy-covered-by-fuel-economy-and-or-vehicle-efficiency-standards-in-2000-2010-and-2022, Licence: CC BY 4.0