Go's probably the most underrepresented, since it currently only counts by the full "golang" term. I need to update the script to find capital G "Go".

I think the numbers are skewed somewhat because of the kinds of teams where Go is used. This is just my observation but more Go usage seems to happening on infrastructure/operations/DevOps teams, where it is used for system automation, metrics, networking montioring, etc. These teams are typically have a fraction of the staffing of companies' greater software developer organizations and thus, the jobs are not as numerous.