Non-parametric LFs determined in different redshift bins via method of maximum volumes (Sect. 5) shown overlaid on top of each other in order to display their evolution. The uncertainties were derived assuming Poisson errors except when the effective number of sources, determined from maximum volumes as described in Ananna et al. (2022), was lower than ten. For such data points, the uncertainties were represented by tabulated errors determined by Gehrels (1986). The evolution is stronger for high-luminosity sources. The last redshift bin was created using a smaller sub-sample of sources and is, as described in the text, less credible.