Looking for outsourcing statistics? The official data is located at the Bureau of Labor Statistics and called Extended Mass Layoffs Associated with Domestic and Overseas Relocations
Or rather, it used to be. The above link is from 2004. Its passing as a data collection point was duly noted by many.
More recent data is mentioned in passing in this report.
Search the document for the phrase: 60,950 workers lost their jobs
Some newer information is given here, but much less prominence is given to outsourcing in these new figures and often it is not mentioned at all.
Here you have arrived at the end of the sidewalk so to speak. I suggest you search wonky news articles from ABI Inform to read other people's takes and context for these numbers.