Fitting results of H₀(z) in the equal-number case for nine redshift bins. The left panel shows the value of H₀(z) as a function redshift. There is a clear decreasing trend with 3.8σ significance at z > 0.3. The green line gives H₀ = 73.04 ± 1.04 km s⁻¹ Mpc⁻¹ from the local distance ladder and its 1σ uncertainty (Riess et al. 2022). The yellow line is the value of H₀ = 67.4 ± 0.5 km s⁻¹ Mpc⁻¹ from the CMB measurements and its 1σ uncertainty (Planck Collaboration VI 2020). The right panel shows the normalized probability distributions of H_0, z in nine redshift bins. These distributions are almost Gaussian.