Fraction of star formation detectable to the approximate average sensitivity of our EVLA survey (F_3GHz  >  10 μJy) as a function of redshift, as calculated by three different means: integrating the Herschel-PACS luminosity functions of Gruppioni et al. (2013), integrating the Spitzer-MIPS luminosity functions of Pérez-González et al. (2005), and directly matching sources detected at 1.4 GHz in Morrison et al. (2010) to the catalogs of Kajisawa et al. (2011). Between approximately z = 0.5 and z = 2.5, radio observations probe about the same fraction of cosmic SFR with little variation with redshift, even though the absolute star formation rate sensitivity limit (right axis and dotted line) varies strongly with redshift. Our GRB detection fraction is shown as a single bin, since our sample size is not yet large enough to provide redshift-resolved constraints.