Top panel: percentage of galaxies in a given Hα EW bin for different samples. As redshift increases, distributions tend to have larger EW. Bottom panel: median value for the Hα EW in different samples as a function of redshift. The gray line represents the best fit. For our sample (triangles), we consider two redshift bins: z ~ 0.24 (red) and z ~ 0.32 (orange). We also plot Shioya et al. (2008) as blue circles and Sobral et al. (2013) as gray squares. To ensure that all samples are complete and comparable, we consider only galaxies with Hα EW > 50 Å.