As requested, the USITC, an independent, nonpartisan, factfinding federal agency, produced an annual compilation of data that has been posted on a bi-weekly basis on the USITC website. The data in the report are shown on an annual and quarterly basis, by category and by Harmonized Tariff Schedule (HTS) 10-digit subheadings.
By category, annual data are provided from 2006 through 2012, and quarterly data are provided from first quarter 2011 through fourth quarter 2012. By HTS10 subheading, annual data are provided from 2010 through 2012, and quarterly data are provided from first quarter 2011 through fourth quarter 2012.
The full report is available at http://www.usitc.gov/publications/332/pub4394.pdf