Distributions of average municipality grapevine yields (n= 606) in hl·ha-1·year-1 in each of the seven clustered zones in Languedoc-Roussillon between 2010 and 2018. The boxplots represent the distribution in quartiles with median lines. Circles represent the mean and filled dots are outliers. Letters correspond to Tukey’s range test for comparison of means. The dashed red line corresponds to the 90 hl·ha^-1·year^-1 maximum label yield used for yield gap calculation. The percentage in brown corresponds to the coefficient of variation over time for each zone.