Global redshift evolution of f_esc, Lyα with an integration limit on both LFs of 0.0006L*. Results from this study are shown by cyan (modified Schechter function) and pink (general Schechter function) points. Power-law fits from the literature are shown in grey and green (B11, Hayes et al. 2011) and the equivalent fit to all the data is shown in red. The fit from Hayes et al. (2011) is derived from results integrated to 0.04L*, and the fit from B11 from results integrated to 0.