A "5-6% drop in wages" isn't "half", though, is it?
And the CIS is an organisation that advocates reducing immigration[1]- excuse me if I take their report with a pinch of salt:
Applications for 47 percent of H-1B computer programming workers were for wages below even the prevailing wage
Note that they switched from "workers" to "applications" on that one. Applications with wages below the prevailing level are usually denied. It's little details like that which ruin any trust I might have in a report that is nearly ten years old.
http://hothardware.com/News/Study-H1B-Visas-Lower-US-Program...