Board of Governors of the Federal Reserve System (U.S.), 1935-. "Security Brokers and Dealers, Seasonally Adjusted Annual Rates," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "September 25, 1990 : Annual Revisions," Z.1 Financial Accounts of the United States (1990-09-25) : 44-44. https://fraser.stlouisfed.org/title/93/item/69048/toc/475601 , accessed on April 17, 2024.