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Robustness checks performed after exclusion of 68 decadal national stability results for which FAO-estimated harvest data were greater than 20% (Methods, n = 437). a, b, Results for simple linear regression models (a) and mixed-effect models using country as a random effect (b) and using only non-standardized variables. *P < 0.05; **P < 0.01; ***P < 0.001.