Nevermind, I found it here, on page 286: http://www.gpoaccess.gov/eop/2008/2008_erp.pdf
Informative paper on the NAICS data used to create the graph: http://www.bea.gov/papers/pdf/SIC_NAICS.pdf
Still trying to find the basic data that this was all compiled from, but there's very little information about it. BTW, I dislike NAFTA because free trade doesn't require government agreements, it requires the removal of artificial barriers. I haven't really developed my viewpoint on its exact effects, but I do think that we will need greater export capabilities to aid recovery from our current problems. I would really like to see statistics which include the "value of circulating capital goods, intermediate non-durable products, or of capital goods which are not yet finished or if so, pass from one stage to another during the process of production," of which I believe a great share is imported.