Evolution of the fraction of LBGs with Lyα > 25 Å equivalent width (rest frame) for bright (filled red symbols) and faint galaxies (open black symbols). Triangles are taken from Stark et al. (2011) and Schenker et al. (2012), pentagons from Mallery et al. (2012), and the circle is from Curtis-Lake et al. (2012). The squares at z ~ 7 are taken from Treu et al. (2012) and are based on a compilation of data (Fontana et al. 2010; Vanzella et al. 2011; Pentericci et al. 2011; Ono et al. 2012; Schenker et al. 2012). The upper limits at z ~ 8 are from this Letter. The lower and higher horizontal bars on the upper limits at z ~ 8 describe the range of uncertainty stemming from contaminants in the photometrically selected LBG sample.