Compilation of Ω_HI results as a function of redshift from this work and from the literature: from this work, from the combined stacking with a linear model (yellow star) and with a polynomial model (red star); from ALFALFA at z ∼ 0 (blue diamond: Jones et al. 2018); from MIGHTEE at 0 < z < 0.084 with the 1/V_max method (orange) and the MML method (green; Ponomareva et al. 2023); from a H I stacking based on WSRT data at z ∼ 0.066 (a red cross; Hu et al. 2019); from H I stacking on uGMRT data at z ∼ 0.35 (brown cross; Bera et al. 2019); from a H I intensity mapping experiment with MeerKAT (pink circle; Paul et al. 2023); from two H I stacking experiments based on uGMRT data at ∼0.32 (blue circle; Rhee et al. 2016) and z ∼ 0.37 (green circle; Rhee et al. 2016); from BUDHIES at ∼0.2 (green upward triangle; Gogate 2022); from H I stacking at z ∼ 0.24 based on GMRT data (cyan cross; Lah et al. 2007); from the cross-correlation between H I intensity mapping from the GBT and optical galaxies from the eBOSS survey (purple square; Wolz et al. 2022); from damped Lyα systems (DLAs) at z < 1.65 from (Rao et al. 2006, downward gray triangles) and (Rao et al. 2017, orange upward triangles); and from DLAs at z > 2 (dark blue squares; Noterdaeme et al. 2012) and at z > 4.4 (black diamonds; Crighton et al. 2015).