Can anyone post a link to the original data source? I'd like to verify this is in fact DOL data. It's much easier to go to an employer with data from an official government source than it is from some site, even if that site claims it got it's data from the source.
Note that (if I'm not mistaken), PERM is the program for green card applicants. I would imagine that GC applicants are on average more senior and better paid than H1Bs applicants.