There is a new study out hinting at some quantifying number of jobs being offshore outsourced. Outsourcing is very hard to get hard data on, simply because Corporations do not want you to know the hard data (for you might demand Congressional Action!).
From the Study abstract:
Despite significant public, media, and academic interest in offshoring, there has been very little data available through which to assess how offshoring has affected US-based information technology workers. In this study, we use data from two new, nationally representative surveys to examine how offshoring has already affected the US based IT workforce, and to test the hypothesis that offshoring is making interpersonal skills more valuable for US-based IT workers.
Our survey results show that 40% of high-technology firms offshore work, and about 30% of all firms that offshore send IT work overseas. Among the IT workers surveyed, about 8% report ever having experienced offshoring-related job displacement, double the average offshoring-related displacement rate across all other worker types, but still implying an annual offshoring-related displacement rate of only about 1-2% per year.
Entire study can be downloaded.