United States. President and Council of Economic Advisers (U.S.). "Real Gross Domestic Product, by Industry, Value Added, and Percent Changes," in United States. President and Council of Economic Advisers (U.S.). "2006," Economic Report of the President (2006) : 289-290. https://fraser.stlouisfed.org/title/45/item/8105/toc/261595 , accessed on March 19, 2024.