Index of arable land needed to produce a fixed quantity of crops (where values in 1961 are equal to 1.0). This is calculated as arable land divided by the crop production index (PIN). The crop production index (PIN) here is the sum of crop commodities produced (after deductions of quantities used as seed and feed). It is weighted by the commodity prices.
Source: Calculated by Our World in Data based on the UN Food and Agriculture Organization (FAO)