IEA (2020), Public energy R&D as a share of all public R&D by sector, 1985-2019, IEA, Paris https://www.iea.org/data-and-statistics/charts/public-energy-r-and-d-as-a-share-of-all-public-r-and-d-by-sector-1985-2019, Licence: CC BY 4.0
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