The Statistical Abstract of the United States, published annually, is the source of much of the data presented in this chapter. The Statistical Abstract is available online from the U.S. Census Bureau and ProQuest. It is likely that a more recent edition of the Statistical Abstract is now available. Go online and locate it. Then determine whether the percentage of U.S. GDP attributed to the primary, secondary, tertiary, and government sectors has increased or decreased compared to the data presented in this chapter.