Board of Governors of the Federal Reserve System (U.S.), 1935-. "Nonfinancial Business Activity - Selected Measures," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1990-1995," Annual Statistical Digest (November 1996) : 187-189. https://fraser.stlouisfed.org/title/7/item/23501/toc/204616 , accessed on April 19, 2024.