The SMBH growth rate is obtained from the central cluster AGN feedback power, which is constrained by means of different strategies and cluster samples. The colors and line types indicate the binding energy conversion efficiency parameters, which must be adopted for the conversion (Eq. (1)). The cosmic time is defined as T_c(z = 0) = 0, and we assume that feedback/accretion started operating at redshift z = 1 (8 billion years ago). SMBH masses can be obtained from the relation .