Fraction of XXL bright cluster galaxies hosting an X-ray AGN (top panel: L_{X [0.5-10 keV]} > 10⁴² erg s⁻¹; bottom panel: L_{X [0.5-10 keV]} > 10⁴³ erg s⁻¹) within a 2r₅₀₀ radius as a function of redshift. We overplot the results of similar analysis by Bufanda et al. (2017). Red lines indicate the respective field AGN fractions. Error bars indicate the 1σ confidence limits for small numbers of events (Gehrels 1986).