Major (μ ≥ 1/4) merger fraction for M _⋆  ≥ 10¹¹  M_⊙ galaxies from kpc close pairs. The dots are from present work, triangles are form de Ravel et al. (2011) in the zCOSMOS 10 k sample, squares from Xu et al. (2012) in the COSMOS field, pentagons from Bluck et al. (2009) in the Palomar/DEEP2 survey, and diamonds from Bundy et al. (2009) in the GOODS fields. Some points are slightly shifted when needed to avoid overlap. The dashed line is the least-squares best fit of a power-law function, f_MM ∝ (1 + z)^1.4, to the major merger fraction data in the present work.