United States. Bureau of Labor Statistics. "Nonfarm Business Sector - Appendix - Annual Data," in United States. Bureau of Labor Statistics. "Third Quarter 1995 [Revised]," Productivity and Costs (February 8, 1996) : 19-19. https://fraser.stlouisfed.org/title/131/item/55771/toc/490766 , accessed on April 26, 2024.