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Global-level population-weighted (a) K supplies (WtdDSK), adequate intake (WtdAIK) and (b) K sufficiency ratio (WtdKSR) 1961–2017. WtdAIK was calculated using the AI values reported by the Institute of Medicine in 2006 (AIK_06), National Academies of Sciences in 2019 (AIK_19) and the European Union (AIK_EU). KSR was calculated using the three sources of AIK. The dashed black line represents KSR = 1.
